"Weapon system flies in the face of traditional RPG logic"

I don't see how this complaint is relevant because the entire Diablo franchise is a far cry from a traditional RPG.

Also, if I read your review correctly, you explained that you found local cooperative play "disappointing" because you have to stay on the same screen and you can't browse your inventory at the same time your friends do? I will concede that this is an annoyance, however I don't really see how that makes local cooperative play disappointing.

Those points aside, I found the rest of your review quite accurate.