I think that while the story of NWN2/MOTB is intriguing, the difficulty level is not adequate.
The difficulty level of the OC seemed pretty well scaled with some fights towards the end a tad too easy (defending CK) but MOTB was a complete walk in the park if you used your OC character, mainly due to the high magic and crafting system employed in both campaigns (you know, starting with a mithril full plate with 30/- cold and electricity and immunity to criticals and sneaks with a praetor shield or custom heavy shield with 3 other resistances buffed with magic vestment +5... add to that your MOTB crafting of 15d6 elemental and +8 enhancement...).
I played those the first time with a human fighter/wm, second time as drow wiz/ek and third time as aasimar fs/bg.
SoZ on the other hand was a nice change of pace where really every skill is relevant at the start for survival, but towards the end, you only really need a few due to your keep income going through the roof (anyone for going afk an hour and coming back to see your character is now a millionaire - or simply resting a bit more for the same effect?). Battles there were scaled nicely though the last act was a bit of a slashfest with nothing being able to stand up to your party (even if you got rid of all your cohorts and played with only 2 PCs as I did for the extra challenge). Was fun to have a few places where sneaking was encouraged though and of course an epilogue that you can dictate.
Played that with a yuan-ti fs/dc though i was disappointed at not having a lot of roleplay opportunities with that race as I should have had IMO outside of a few "I am yuan-ti too" which didn't even elicit a response most of the time.
And a hint:
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