Hearthstone: Heroes of Warcraft -
#8 Priests -
Priests have been nerfed pretty badly and every other deck outscales them, they have a lot of weaknesses :
Weak and unreliable control options so forced to play minion heavy decks.
You have really bad matchups vs control and will almost always lose to Control Paladin, Control Warlock, and OTK Warrior.
Second worst, maybe worst class legendary in the game, which is such a trap card
End game requires a lot of legendaries (similar to most Druids) to be successful which makes it prohibitive for beating the gauntlet (ranks 5-1) for legendary-less
Very limited build paths for high level play, you can build most of the classes a couple of different ways but there are very limited options for making a strong Priest build, thus making it predictable.