I think the rocket launcher guys were a cool idea to limit the player snowballing out of control but they were unfun when they'd punish you for doing well, it would make sense for them to come out later game, but something like a faster shooting rifleman would make sense to scale up killing power without getting to the point where numbers basically don't matter. I also enjoyed using houses to split up my horde, but it didn't feel like an intended way to play the game, and I would've loved ways to control the zombies into different groups more easily.