I still play Diablo 1 Hellfire until today.
With patches and patchfixes you can play up to v1.02 multiplayer with Warrior, Rogue, Sorcerer, Barbarian or Bard.
As far as I know, there are still a few private servers up for that game
(Only with hardcore mods)
Last year even Diablo1 bnet servers were online, dunno if they still are.
My favorite is the sorcerer, doesn't need much equipment (because he simply can't wear it) and Mana Shield turns him into a tank!
So if noone wants to play with you at the moment, a solo run is no problem with the sorcerer
Though, it's a shame there was no magic amplifier like Kings Staff with 150% extra magic damage or something.
That game is just great