#10 RIFT
Rift is an MMORPG that appeared more or less from nowhere and took the market (previously thought impossible to breach thanks to the presence of World of Warcraft) by storm.
Set in the fantasy world of Telara, the game has its own sort of logic—Telara is the focal point of the five different elemental Planes, and exists where each of these planes intersect. Regardless of how it's constructed, there's a lot to explore, and there's even portions of the elemental planes (which are entirely instanced) that you can visit in Rift.
The best thing about Rift is its open raids, which allows public groups of dozens of players to team up against invasions that happen sporadically across the land.
