Never felt like a chore for me. Completed at least 4 times since release.I've played through it twice, once when it was released and again in 2009. Both times were a chore but there are some strong links to the story of the first game that are worth seeing and if weren't for those then I probably would never go back to it.
I think IW could have been a really great game if they didn't downgrade the interface and dumb the game down so much.
Installed and got it working with a mod at 4K. Will be starting again soon