NWN is not a "terrible game". Fallout: Brotherhood of Steel is a terrible game. Might and Magic IX, Dungeon Siege, and Beyond the Beyond are terrible games.
Bioware obviously wanted to just make a toolset with NWN, then belatedly realized that no one would buy it without a single-player campaign out of the box. Therefore the campaign is tacked-on and not as good as it could have been, though it's not awful either. They needed to make money and released it in an imperfect state. I saw it marketed as a toolset with a campaign included myself, but Bioware's marketing department is certainly not squeaky clean. This does not make them villains, nor does it make the OC "terrible". Shadows of Undrentide and Hordes of the Underdark are much better, though HotU being incompatible with multiplayer play without a fan-created patch is rather ridiculous for a game founded on multiplayer, and the way Bioware has responded to complaints about this doesn't really reflect well on them either.
Knights of the Old Republic is an excellent game, one of the best I have ever played. I don't have "faith" in Bioware, they're just a company run by human beings who want to enjoy their jobs and make money at the same time. However, I will buy a Bioware title without reading reviews, and I can't say that about any other game company.