The NWN OC is a borefest even in MP.
Fun fact the OC in the original game was never intended to be an OC. It was originally built to demonstrate the capabilities of the toolset but someone came by later and convinced them to build it into a full SP experience.
I've been playing NWN1 recently and it's been hard to come back from NWN2. I think for a pure melee experience it's playable (with the exception that my rouge companion likes to not disable traps). but with casters....oof that's just sucky.