If your talking about Diablo II, then yes. It is a timeless classic that still retains its fun factor today. I didn't even play it until last year, shortly after its 10th anniversary. It is by far one of the best games I have ever played. Not to mention pretty much any PC can play it at maximum graphics. It is quite addicting, and I'm sure you will enjoy it.
As for Diablo III, this cannot be fully answered by anyone because the game is not fully released yet. There is a beta out currently, but that is just a beta, and not the final product of the game.