Short answer - Yes.
Longer answer - HELL YES, it's not similar at all. At least MOTB isn't. NWN 2 has the generic quest to kill the Foozle, but it's still fun. You'll have to just play MOTB to know just how different it is. I wouldn't want to spoil the surprises in store for you.
NWN + HoTU is very good. But is there any particular reason to buy NWN2 + MotB since it sounds pretty similar ?
The Foundation trilogy is very good. But is there any particular reason to buy the Dune trilogy since it sounds pretty similar?
Then get Storm of Zehir. More traditional style of D&D (you create your whole party from scratch, not much 'talky-talky', you should finish it by the time your party is 18-19 I think). I couldn't finish it though, the last battle was just too much for my level 16 group and I didn't feel like 'grinding' upLet me ask folks a question about MotB: Is the reason you enjoy this game because of the storyline? I just could never get into MotB because it seemed full of talky-talky and I like action. High level D&D is always boring to me too. I love AD&D from levels 1-15 or so. It's acceptable up to 20. After that, the game just becomes ridiculous. To me, prestige classes just ruined the game. Crafting magical stuff is another game killer. Magical items should take months and months of time to create, so having it in a game setting is silly. It would only make sense in a persistent world type of setting.