I'll see if I can dig it out of my basement...
I don't ever remember there being so much trouble around getting a video game installed :p
I've played every MW game on or shortly after release, and most of the rest of the BT games too, and I can say that the MW franchise has been responsible for more hardware upgrades on my part than any 3 other factors combined.
Our game can be a little tricky, but that's due to it being a mod of another game, and not just any mod, but a "full conversion", where there is almost no discernible relation to our game and the game it is built on. Believe it or not, it's gotten rather easier to install and play than it was in our first beta release: you don't even want me to get started on the difficulties we had in early alpha ("Mystery folder restored", anyone? Sorry, inside joke.)
We feel it is definitely worth the effort, though, and once you get in and playing, assuming you don't have experience any problems, I expect any initial difficulties will be quickly forgotten; please remember, however, it IS a
beta and neither feature complete nor remotely close to fully stable, and thus problems of various sorts are not only likely, but to be expected. We're here to help though, so please don't hesitate to post in the appropriate forums (after checking the stickied threads to make sure it isn't already addressed somewhere) if you need help or have questions.