Trade only: Yes, you go first
Will make many unplayable cards usable
Combos with:Flame Imp
Bloodbloom +DOOM or Twisting Nether
Best combo Unlicensed Apothecary for each minion restore 5 health
Chittering Tunneler better Ivory Knight
Felfire Potion restore 5 health to your hero
Fuck you odd demon hunter in wild, now you will have to deal with spreading plague properly.
Honestly, no it is not. And we get a thread like this for every expansion. Do not try to say that the expansion only released 3 good cards. Hell a lot of Cubelock's cards are actually from this expansion. Also Elven Minstrel and Dire Mole are in most Rogue and hunter decks respectively.
The worst expansion in terms of power level is probably The Grand Tournament. However the worst expansion in terms of its effect on the metagame is probably Mean Streets Of Gadgetzan. MSOG may have done the most damage to the metagame because that expansion has Patches, Jades, Raza and Kazakus and it is responsible for three of the most oppressive decks we have had in hearthstone (Pirate Warrior, Jade Druid, Razakus Priest).
The thing about Kobolds and catacombs is that there are actually some pretty decent cards in there especially the commons. The problem is they can't breathe in this metagame. The top decks are too oppressive.