I played Left 4 Dead and Left 4 Dead 2 over and over. Back 4 Blood is everything I'd wanted from their long-awaited sequel.
Gameplay and mechanics are what players of the earlier games expect. The graphics are fantastic. The game director does an incredible job of making the game always just a bit hectic and a LOT hectic when it should be.
The new card system and weapons systems upgrades are cool and add a lot.
The ambiance and story are WONDERFUL. If only they called zombie's zombies.