DOS 2 is everything RPG RPG. One of the best RPGs, not only RPGs - but the best games I've ever played. In short, they took everything that was best from DOS 1 and squared it up. Or even into a cube.
The music alone is worth playing.
Combat is too varied - you can do whatever you want - do you want to teleport an enemy, or even an ally into lava? No problem. Do you want to turn into an arbate sniper who ends battles before even starting them? Green light.
The plot is even better than the prequel.
The characters, both playable and non-playable, are very well written. Everyone has their own motives and inclinations.
Some may be put off by the fact that the game has turn-based combat - but I'm sure they will fall in love with this type of combat if they give the game a chance.
I've only played alone, but I can imagine how fun it would be with a friend.
In short, stop messing around - go play DOS 2!!!