I am coming at this review from a slightly backwards perspective. My second review on this blog was actually Call of Duty: Modern Warfare 2. I had never played a CoD game prior to that one, and honestly had never had much interest in it or first-person shooters at that point. However, when MW2 hit, it was tremendously popular around my workplace. Finally, two of my co-workers chipped in and basically got it for me for free - so I felt compelled to not only play, but sink a good deal of time into it. Turns out, I enjoyed the game a great deal. I haven't played MW2 in a couple of years, but plan to do a re-review on it in the somewhat near future.
See, I eventually traded it in. I had been playing it quite regularly, but when most of my friends quit playing, so did I. Then my son got into FPS titles on the PlayStation 3, which has the added benefit of allowing people to play multiplayer titles for free (he does not have a Gold account for Life). So, my son bought Modern Warfare 1 and 2.
I only recently played the first Modern Warfare, and even though it is not a title I will probably play with any regularity going forward, it really gave me a unique perspective on the series' growth.