Lately I've been on a 'complete the campaign of a game' spree. I completed Halo 3, Halo 3 ODST, Modern Warfare, Modern Warfare 2, Rainbow Six: Vegas, and Batman: Arkham Asylum all within about a month and a half... I'm not too worried about gamerscore at the moment, just playing campaign's.
Im still only half way through Double Agent. I have quite a few games that i bought and never really completed. I was really hyped about The Sabotuer and i bought it, and have only done 3 or 4 missions.
It really pisses me off that there isn't a versus mode though. I'll never forget the endless hours of Chaos Theory that I played. Unfortunately, Double Agent just couldn't compare... I want something more along the lines of Chaos Theory.