Hearthpwn

Shaman of course, for 3 reasons 

1. I think the hero power is too inconsistent (useless you get taunt totem every turn or something like that)

2. Overload cards are just not good enough.  Wanna lose mana for few benefits ? No, thanks.

3. The current most viable deck it's a face deck, that you basically lose if you don't get Doomhammer on time.

Priest.  It's the most slow, reactive class.  I prefer more proactive strategies.

Hunter is my favorite. Idk why all the hate, any hunter I see nowadays is a respectable midrange deck. Anyway, probably Shaman for least favorite. Face Shaman makes me sick. Coming from a hunter player, that should mean something lol

you gotta be kidding me man, you should change both avatar and favourite class then

Personally I don't really have a class which I dislike to play with.

I won't play Rogue...straight up.  I know being a player of such combo decks as Freeze mage, murloc paladin, and Velen Priest, should translate over to Rogue well, but every time I try to play oil it just doesn't seem right.  When I win, I don't feel like I won because I played well, and when I lose (which is sadly more often then not), it seems like my victory hinged entirely on how good my draws were early. 

Least favorite class to play would have to be Priest.

Least favorite class to play against would have to be Paladin. They are out of control right now, too many good cards at every mana spot while the rest of the classes are all lacking.

Quote from alpharaon >>

you gotta be kidding me man, you should change both avatar and favourite class then

Personally I don't really have a class which I dislike to play with.

the druid class. every druid deck is the same. soooooooooo boring.

If it hadn't been for the Force of Nature Savage Roar combo, I think I could have enjoyed druid.

That combo is just moronic, though.

Not necessarily that I hate it, but I can't seem to get the hang of playing Rogue, though maybe I can try the Raptor Rogue. I think it's mostly because all the popular Rogue decks rely on big combos to finish the game (Not the game mechanic, I mean "Southsea Deckhand, Sharpsword Oil into Blade Furry" kind of combo). That being said, it's a class I'd like to get better at, even if it means trying a deck that isn't so combo oriented like Raptor Rogue (At least I don't THINK of it as combo oriented deck).

Honorable mention goes to Paladin. Maybe it's just my inner hipster refusing to play Secret Paladin, maybe it's just because I've never found an archetype I like (Anyone have a good Dragon paladin deck?), or maybe I've just never bothered because I don't have Tirion who is in every other paladin deck. Either way, Paladin remains my least played class for whatever reason.

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As for class to play against, for some reason I've always hated playing against mages. Maybe it's part envy, because for a while Mages had 3+ viable archetypes while Priest barely had one, maybe I just hate dealing with secrets, maybe it's just that they have the tools to deal with just about everything, or maybe it's just that Freeze Mage encompasses everything I hate about the mage class

Warlock. The class hasn't appealed to me in either Hearthstone or WoW. 

In order from least favorite to favorite:

9: Mage - it just never clicked for me. And Freeze Mage wins the cake for being the least fun deck ever to play against to boot (nothing like sitting there not doing anything for 20 minutes until you die).

8: Palladin - I always wanted to like them, as I'm a fan of buff-oriented classes, but then Pally went all crazy over the last couple of expansions, and all of it's viable decks are boring to play. The only reasonably fun deck they have is so bad I can't stand it (Anyfin Pally).

7: Warlock - because Demonlock is the only style of Warlock I really enjoy, and it's the worst archetype they have (that's still viable).

6: Rogue - again, the problem is a lack of viable decks. I get bored quickly with them. I like the idea of Rogue, but playing it gets boring. I do really love Raptor Rogue though, hence not in the bottom 1/3.

5: Druid - similar reasoning to Rogue, but Druid has more variety within it's one viable archetype.

4: Shaman - the RNG is fun for me, the lack of viable archetypes is not so much. I enjoy them, but i don't enjoy losing with them.

3: Warrior - My least favorite heavy control class. I like it fine, and I play them a lot, but I do get a frequent feeling of "I'd rather be a Priest".

2: Hunter - Face, Mid-range, the less than viable control. There's no Hunter decks I don't enjoy.

1: Priest - blue was my favorite color in MtG. I always play buff/debuff characters in MMOs. I love hard control, and Priest does it just the way I like every time.

Druid and hunter. Both are very one-dimensional: the latter is handicapped by its hero power whereas the former almost exclusively relies on Savage Roar/the  combo to win.   

Shaman and hunter :/

Mage. I hate Mage with every fiber of my being, and so much more. Being a Priest main, and kind of relying on my strong Spells and Minions, nothing makes me more upset than Mage secrets. Mage has truly annoying removal via Blizzard and Flamestrike. 

Not to mention the synergy Mage has with a lot of minions, since they can throw out a lot of spells in one turn. All my troubles in Hearthstone are usually because of Mage. 

DON'T GET ME STARTED ON ALL THE FREEZING.

[INTERNAL SCREAMING]

Warrior and warlock ... and I dont know why but I dont like playing them

I don't like playing priest much because I'm bad at it. Otherwise it used to be shaman for the same reason. Not a big fan of Paladin due to not have MC so no use of even trying... beside OTK/murloc decks.

Priest - I hate playing it, I hate playing against it.  I don't mind some control, but Priest decks that I play against are almost entirely based on taking what I have.  Occasionally I run into a Burst Priest or a Dragon Priest, but most of the time it's just a bunch of Cabal Shadow Priest, Shadow Madness, card thievery.  I get it, my deck is good enough to steal, but srsly - presit pls

 Shaman, because it's weak, RNG-based, overload is annoying, and the only viable deck is a facetard not even consistent. I also dislike the heropower, the only RNG of all 9....

The class i hate the most playing against is druid (for me there is only ONE cancer deck : midrandge druid, aka fun deck killer), this feeling of hopelessness when u try desesperatly to stay above 14 health and take a Dr Balanced turn 5. And quite surprisingly, priest, even if i like playing it (I especially dislike mirror match-up,rather strange)

My favorite classes to play are mage (I'm a inconditionnal fan of Echo Mage since its creation ,and i like to play value mage). I also find them honorable opponents, tempo mage give me at least a good match up in dreadsteed and i find the freeze mage match up actually interresting with some decks. My most favorite is obvisouly warlock with its variety, and i also love hunter nowadays, because playing stupid control deck is so fun due to the reputation of the class (credit to the most fun class)

One of the reasons why sometimes I hate the Hearthstone community is that most people think hunter = face. This topic just proves it. Hunter is my favorite class in both WoW and HS and I hate face decks. 

My my least favorite class is druid. I hate it because it has everything. Card draw, heals, mana acceleration, strong early game minions, strong mid and late game minions, exclusive mechanic, OP combo etc, and blizzard just keeps giving them more good stuff and they ditch other classes like rogue.