well it seems as if the cult are the ones i know the least about playstyle wise. not too many of the people in my store play them. so since i can't be any help i'll tell you what i know (which may not be much)
Monks: VERY synergistic, lots of buffs and chi manipulations
Samurai: Very combat oriented, armor on most, leader can decapitate pretty much anyone
Savage wave: usually a single almost impossible to kill beatstick, but a lot of little crappy gremlins. however, the gremlins can activate simultaneously which makes them much better than they would be individually. not to mention the gremlins can teleport around the board.