If you haven't caught a glimpse yet of either Borderlands 2 or XCOM: Enemy Unknown lately, well, you're probably in the minority. Take-Two have released an official press statement containing their assessment of the games, and the results are positive:
2K launched Borderlands 2, which has already become one of the most successful releases in 2K's history. The title received rave reviews, highlighted by an average score of 90 on Metacritic, and has sold in over 5 million units to date, including strong digital sales. Like the original game, Borderlands 2 is being supported with four downloadable add-on content campaigns, available individually or combined through purchase of the Borderlands 2 Season Pass. Borderlands 2 selling 5 million is a surprise to me, though perhaps it's telling that the exact results of XCOM's sales haven't been revealed just yet. It certainly looks like we'll be seeing frequent DLC updates from here on out, but hopefully both games will do well enough that we'll get some more sequels down the road as well.
2K launched XCOM: Enemy Unknown, reintroducing one of the greatest video game franchises of all time. The title is proving to be a critical and commercial success, with strong digital sales and a near 90 average review score on Metacritic. XCOM: Enemy Unknown is being supported with two downloadable add-on content packages available this year, with additional content planned for 2013.