There was a handful of games with better metacritic scores then DAI that year. If the judges voted the same way their companies rated the games DAI doesn't win period. Even if Bayonetta 2 is considered too niche to win the award, Dark Souls 2 says hi, and is at least in line with Bayonetta 2 reviews wise. DAI was not.
Last I checked, you knowing about a game does not make it deserving of GOTY. Hell if I go off of what I get out of your posts, you sure as hell shouldn't be judging what is GOTY or not.