I really like Undertow. Too bad everybody climbed on the hate train when it came out and called it a terrible game without giving it a chance. It has an interesting (although cheesy) story, multiple factions with different character types, frantic 8v8 multiplayer, co-op, some fun territories-style objective game play, 4 character types to choose from each with advantages/disadvantages, RPG-like selective leveling of character types, power-ups, and a familiar geometry wars control scheme with cool underwater visuals and sound. What's not to like?