Well, here's a list that I will be updating on occasion, of games that I feel have slipped under the radar, undeservingly.
First off, and one by which I feel it to be very undeserving;
Spec Ops: The Line.
You and two other soldiers under your command travel to a sandstorm-ridden abandoned Dubai, in hopes of finding the remains of a military crew, and extracting any surivors still present. But along the path, it goes wrong and wrong again, despite your best efforts to do good. It shows that even the most righteous of choices, can lead to the most hellish of outcomes, leading your crew to doubt you, and your sanity.
Solid gameplay mechanics, as a third person shooter. Beautiful graphics, and compelling story. Amazing soundtrack, even featuring my favourite band, Mogwai! I was very pleased to hear 'Glascow mega snake' starting to paly during an insane battle. Rather memorable fight.
My opinion? 9/10, solid if simple gameplay, great graphics, compelling story and sweet soundtrack. I'd play it for the story alone, already.
Too lazy to add more atm :)