I played Diablo 1 back like 2 weeks ago and got a friend that was playing Diablo 2 into number 1. Very challenging. We took our party of 3 to try and kill the Skeleton King when we were level 6. It took over 45 minutes and we still couldn't kill him. Diablo 1 is a very good single player with more quests. It wasn't very multiplayer friendly because you could hit your friends with arrows or spells if they got in the way.
Click on a cow many times and you will hear some funny comments.
The fact that you could kill your allies with your shots meant the game became more about tactics and less about just button clicking and unleashing doom.
Thynqikan