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Preast may seem weak but as a warrior player they are pretty much unbeatable. At least for me. Can't remember last time I was able to beat a priest with my tempo or control warrior. I get wrecked every time. 

Quote from Gabrielm1234 >>

Preast may seem weak but as a warrior player they are pretty much unbeatable. At least for me. Can't remember last time I was able to beat a priest with my tempo or control warrior. I get wrecked every time. 

They're all the weakest class, Thus, it's balanced. And the circle of life goes on.

Quote from Nuba >>

Tempostorm tiers are not correct, don't expect them to be.

I think Mage is the weakest right now. Don't think Freeze is enough to justify mage being "playable", despite having reached legend with Reno mage

As far as laddering is concerned -
I think their are five very good decks:
1. Shaman (Aggro/Mid)
2. Tempo Warrior
3. Warlock Zoo
4. Miracle Rogue
5. Midrange Hunter
Then you have situational decks (could be excellent but depends on the metagame)
1. N'Zoth Paladin
2. Renolock//Handlock 2. Reno Mage
3. Freeze Mage // 3. Control Warrior //  Control or Control N'Zoth Priest
Then there are good decks:
1. Midrange/Ramp/C'thun Druid
2. Tempo Mage (// Tempo C'thun) Mage 
3. Dragon Priest
4. Deathrattle (Raptor) Rogue

From these observations we can see that Priest is the loser of the metagame.
It is only valuable as a situational deck and it is not even the best pick from the situational decks (if you only face n'zoth pallys then it will be the best deck ofc but, hell, i can't imagine this day coming soon). 
As I stated in an other thread, Priest got hit too toughly just after seeing some decent days after LOE.

i'd say Druid or Priest

Quote from Sakubo777 >>

Priests. Can't ladder well with it. Don't really agree with Hunter being weakest though. Midrange is pretty strong but it does have a severe card draw problem.

Priest or Druid. Both lost very important cards and got nothing good enough to replace them.

I'm going for druid... to be honest, after all the combo druids and SMOrcrages I had to stand, I'm perfectly fine with them not appearing that much (most of druids still are BM douchebags, so why should I care?). Now I just need a break from retarded shamans... and that's it.

Priest because of losing the ability of board control and aoe clear and Druid for lack of anti aggro defense. 

Idiotic that Priest has the most votes. It has a tier 2 deck in N'Zoth Priest.

Druid is in a far worse state.

Priest, it's just not reliable enough right now.

American Preliminaries has 6 druid decks, 0 priest decks. (out of 20 people)

http://www.hearthpwn.com/news/1463-notable-player-decks-for-the-americas-spring

Not really, Dragon Priest is better than N'Zoth and Token Druid (Violet Teacher + Power of the Wild) is better than any Priest deck in this over-aggro meta.

If you know how to play Druid, than it is better. But overall Preist is just easier to play, making it somewhat better.

Quote from UmbrageEU >>

Youre right, only non crap cards for constructed mage got are forbidden flame and cabalists tome, and they arent too good anyway, but it isnt bout who got the greatest cards but who turned out the best

Oh and that 2drop with spell dmg really got tempo mage going

Whoever says druid just doesn't understand how broken Innervate and Wild Growth are. It will never be the worst class as long as they have this advantage. I'd say Priest because they need to have their answers and drawing cards with priest is bit tricky.

I would say that druid is the worst class atm, then comes priest.  (Priest would be the worst if it wasn't for N'zoth)

Hard to draw cards?