I would say: Underrated: Resident Evil Revelations. Blew me away, and I generally hear so little about it. But, I'm an old-school RE fan, so I loved this entry's throwback feel.
Overrated: Virtue's Last Reward. I haven't played it or 999, so it's a baseless claim. They just don't seem to appeal to me at all and this board is pretty crazy about them. --- "I dare you to make less sense."