Definitely. I like left 4 Dead because it is a simple, sit down and play game with one purpose: mow down zombies. However, I would like to see increased numbers of non-special infected. The only times large groups come are when you are blinded by boomer bile. I want more zombies standing about, more zombies per horde, longer hordes, and more ways for horde-like waves to be called. For instance, firing guns makes some zombies spawn and charge like a small horde. Other than that, I don't really want to see much more, except some more interesting defense sequences some times. Honestly, I feel like holding off hordes in apartment buildings and houses without having to deal with a tank would be fun, because you worry about holding off numbers rather than killing a zombie god. Still, the Left 4 Dead series is very fun and I'd hate to see number 2 be the last one.