I'm sort of the same, but by the time you go back to complete some games it is impossible as you have to get online achievements, and either there is no traffic or the people are just way too good.
I did say to myself I would complete MW2, but I can't get through the story on the hardest level, stuck in the Favela and every time I try, I die 5 times and think f**k it I will play some team deathmatch!