After a period of time playing Diablo 2, you don't even need a "better" game like it that you can play online for free. You just need a "new" (read: New to you) game like it that you can play online for free.

There's plenty of games that look like D2 and play like it. There was one that I played a demo for a good while back... The differences are that it's set in a more... Oriental style, and you get three characters. I enjoyed it. I'm sure the full game is plenty of fun.

Just look around for screenshots. If it looks like D2, it probably plays like D2.

What is it they say about silence being golden?