A nice platformer mmorpg that keeps the gameplay simple and the story behind the game fun to examine.

A DC fighting game built like MK but not as flawed and pathetic as MK Vs DC. Love it!

Co-op and fun. Taking down your own partner can be a joy all on it's own *cue the evil laughter*

What can I say? Online mutli-player. Multiple classes to choose from. Highly competitive. It even allows seasoned players to be coaches for newbies

Co-op shooter with tons of replay value. A classic for anyone into the genre

Multi-player fast paced fighting game with unique characters and stories

Single player and multi-player fighting game with a great story for each character and fast paced combat

Is an excellent co-op puzzle platformer that uses an excellent physics engine

Online D&D style rpg that allows cross-platform co-op with a nice array of character customization.

Both a co-op and competitive game. It has a nice action, rpg, and platformer element with plenty of stuff to unlock.