I've been playing this game a lot lately, and I have to endorse it because it is different than most releases now a days. You follow Enoch (who was a biblical character, one of the few brought to heaven without dying.) and you travel down to the tower to purify 7 fallen angels. Its not preachy or anything, I swear, but the story is quite gripping and the worlds are beautiful. I'm roughly 50% through, I'd say, and its still kept me really hooked, which is unusual lately.
Anyways, I'd highly reccomend it, and I have doubts that it has sold too well since its sort of a niche title, but if you are looking for something that isn't Gears or Deus Ex to play for a while, this is my reccomendation!