I've put something like 100 hours into COD4 (across my PS3 and 360) and I've played maybe 2 hours of the mission.
It could be MP only for all I care. It's a great game. I've got Gears 2 but I haven't done anything but a couple of the tutorials. I'm splitting time between Mirror's Edge, COD4, Fallout 3 and Fable 2 in addition Braid, of course.
My wife has bought me Left 4 Dead, Star Wars Force Unleashed (we're big star wars fans) and Prince of Persia for Xmas so I've got lots of gaming to do.
Anyone up for some Left 4 Dead next week? I hear it's a blast with people you know.