Zoo decks that spam face are the ones that lose more. Zoo is all about cheap, efficient trades and overwhelming board presence. All it takes is one good boardclear while the opponent still has minions, and zoo is fucked - they NEED to control the board. Same with DS pally, because these two decks do not suffer the same problem as other aggro decks that don't face - they do not run out of cards thanks to Life Tap and Divine Favour.
They are control, just with smaller minions.