Some strange design-decisions in the first part of the game (recommended Installation): Monsters give less XP and Loot, most +1 Weapons are downgraded to Masterwork. So I was with a bunch of 1st-Level-Characters before the endboss of the Nashkell-Mines, killed all the "support-troops" and couldn't even hit the boss
before I was into NWN I was looking at the mods for the Infinity Engine games.
One problem I had with the changes was the reusing of old areas. Quests and NPCs were fine but create new maps mixing connectors was just confusing.
most +1 Weapons are downgraded to Masterwork.