Yeah I just don't think games are worth as much as the price tag says.
It was 40 bucks, now it's 50 bucks. The campaign is about 6 hours which is average for a first-person-shooter, but then throw in the separate cooperative campaign and it adds 4-6 more hours depending on who you play it with.
Also we're talking bioshock-quality scripted events, and the amazing humor from Portal 1 throughout it all.