Consulting CriminaI
Try
Eden Eternal.
It's fun, free, with decent graphics for a free game.
I love this game.
Play it with my friends all the time.
gaia_crown
I hear that its somewhat fun, but I wouldn't say that it's decent graphics for a free game. Look at games like Forsaken World and Aika Online, they're free and have generally 10x better graphics than games like Eden Eternal, and pretty much anything that comes out of Aeria Games.
I do play League of Legends though.
By the way, if you liked Diablo, you might like Dragon Nest. The graphics are in a chibi-standard, but the game engine itself is fun if you try it. It's sort of like an action MMO, not a turn-based MMO like everything else. The Acrobat or the Sorceress class are the two most fun classes, because they have quick skills that blows s**t up.