Bethesda makes well liked games, yes. But they have a track record of their games coming out as complete buggy messes that need 6-12 months to be in a decent state.

Could be in this case that Microsoft has realized how important this game is to their console efforts and the delays have been an effort to avoid a repeat of Bethesda's typical. I wouldn't be too surprised. I'd recommend being wary until the game is out. Waiting won't hurt anyone.