Having fun with friends have never been so frustrating.
When one of us start talking to an npc either picking up quests or selling, the game freezes for the other one until the dialogue has ended. Which makes trips to towns take forever and picking up and reading quests unbelievable boring for the person not talking to that NPC. So after just a few hours we gave up and threw the game out.
After a few weeks I decided to give it a go playing it singleplayer, although not as enjoyable as experiencing it with a friend I figured it should be able to give me a few hours of fun. A battled my way through the quite boring intro part and headed of to the real first dungeon. I started clearing as I always do, always taking left turns and then backtracking so that I leave no corner untouched. To my surprise there were enemies in rooms I had already cleared but I figured they were the occasional roamers, but after awhile it became clear: They werent any roamers these are respawns, which for me personally destroyed the game.
The loot W***e that I am, I just cant leave black spots on the minimap and with all the moving back and forwards between rooms and having respawns made one dungeon take forever and get VERY repetitive. My advice if you havent played NWN already, pick up NWN play through it with a friend and think of NWN2 as the game that never came out.