On diablo 2 (and diablo 1!) I always kept several characters that I used when adventuring with certain mates online. The beauty of Diablo was that it always played completely differently with different characters and builds, so I didn't mind levelling 5 different characters (at different rates depending on who I was playing with).

This changed with Diablo 3. The game is completely soulless compared to its previous counterparts, and I could not even stomach finishing it the first time round. This was on console. I can't imagine it would be any better on PC, as it was not anything to do with the interface that bothered me, it was just the game just is not anywhere near as fun to play as the previous two.