Yes I finished MW2 in 6-7 hours. However, since then I have spent over 20 hours in MP as well.Didn't you like MW2? Similar campaign length. I don't mind if it is very good. This seems to be a bit of a let down. A horror game that runs long might get old. After a while there is only so many ways you can scare the player. Original Dead Space was around 13 hours. I bet this is similar length for the average gamer. Typically the people who finish first rush through it. Just check how long to beat.com. Initial reviews are always short, then as a few weeks pass the average time to beat goes up. This is probably closer to 11-13 hours for anyone not speed running.
This is just an average game at best. Ain’t nobody got time for that.