Not at all. As long as it's fun, we'll play.
So you're looking fora 2 or more player ARPG...Hmm
Dungeon of Fayte - This does not play exactly like Diablo but it has the same sort of mechanic. The graphics are 8-bit. If you're looking to play online only then this won't fit for you guys since it's a HOTSEAT CO-OP meaning 2 to 4 ppl can play on the same machine.
SECRET OF ULTIMATE LEGENDARY FANTASY UNLEASHED - If you have LAN multiplayer as a option you can try this.
Summoning Wars - This is good for online play for 2 to 8 players.
I Shall Remain - Prologue - Though this has RPG like elements it plays more like a top down horror shooter.
^ I don't think these games fit exactly what you are looking for but take a look. I do an awful job for sorting the games at times especially when they are in genres that I don't play much.
It's not on my list but Drakensang Online is a good Diablo-Like MMO. I played it awhile back and had a good time with it without spending a dime.