Dungeon Fighter Online. Indefinitely.
I don't think any game would've gotten me interested in MMO's any more than this one. I played one MMO, but then I didn't care anymore. But this? A mix of RPG elements with 2D, sidescrolling, beat-em-up action, what more could you want? It's been about 2 years since I played this and like most F2P MMO's, it's constant updates make it better and better.
If you want your run-of-the-mill hack and slash, try Rusty Hearts. It mixes these elements with the like of Castelvania.






