I keep trying to think of ways Oblivion could make games without the bad endings, but it involves working on the endings before finishing the beginning and middle, which may be worse.
Or, they could push back the release date and finish the damn game.
I honestly didn't mind NWN 2's ending too badly. Biggest problem with it was: the ending art-stills sequence had no voice actor, it just sounded like a random nerd DM telling me some backstory. Hardly an epic ending to the quest. The Shadow King encounter played fine though, even if it was irritating that the majority of your party members suffer the stupid "rock falls, everyone dies" fate absolutely nonsensical for 20th level DnD casters. Well... that and the "mandatory" betrayal of at least one of your party members, regardless of your influence with them. Fine, come to think of it, there were a lot of little annoying things about the game ending. Still, it was nowhere near as disappointing as KotOR 2, which just leaves you with a huge WTF feeling.
Well, I'm not a fan of the Fallout world anyways, so I doubt I'll be playing it. I'll rely on you guys to tell me whether Obsidian improved for this one.
Keep in mind though that they made quality complete expansions for NWN 2. It's clearly possible for them to make a finished game, at least when the engine is already done.