Oh yeah, now that you mention it I don't recall playing that many rpg co-op games with my bro. I did play DoS1 & 2 for sure, don't think we ever finished one and did two, twice or three times.
I've played Grim Dawn with one and two other players, this is more of a diablo-ish game.
These others I'd recommend but haven't played mulitiplayer with them personally.
Solasta: Crown of the Magister newest DLC included 4 player co-op
Dungeon Siege 3
Neverwinter nights enhanced edition (I actually played co-op on the original NwN before dlc a real long time ago, good stuff)
WilderMyth
always looking for good co-ops if you recommend any feel free to toss them my way.
