Diablo I or II?
Diablo I was ruined online by blatant cheating. I think that was the last time they allowed character storage on the clinet side
. Single player: great game!
Diablo II: The online cheating wasnt as bad as Diablo I. I played some online but mostly SP and again, I liked it a lot.
I wasnt a real fan of WCIII, but a lot of people loved it. Then again, I suck at WCII so that might play a role as well