#1 Guild Wars 2
When ArenaNet first released Guild Wars, the game offered what the developers call a "cooperative online role-playing experience". Rather than being set in a large, expansive open environment, players were confined into multiple instances, which were generated on the fly depending on the player population.
Much like World of Warcraft's dungeon instances, players could then group in in teams of four to eight to complete standalone missions. In addition to the cooperative missions, players could also do battle against each other in competitive arenas—a feature which gave Guild Wars its name.
The developers plan to set Guild Wars 2 in a wide, open environment where battles take place across large battlefields rather than scaled down instances. The skills have been streamlined to make player teams less dependant on their equipped skills and more focused on performing actual teamwork.
Like its predecessor, Guild Wars 2 will be completely free to play.
