I'm quite familiar with Eat-this! and it hasn't been very active lately, at least not apart from Last Stand which means killing braindead zombies. Zabijaka is "normal mode", which basically means you can't use anything but M79 and Barret because it doesn't kill. So basically both are brainless.
What I'm looking for is some fast paced an active fun, where playing for the team is crucial part of an actual joy and where manufactured "bugs" don't prevent you from doing so.