Did someone really just compare Bioshock to the best selling shooter game of all time?
Nope, Duck Hunt was never once mentioned in this thread until your post.
I also partially disagree with your assertion that the comparison is completely flawed: while the pointer controls DO add greatly to the game, there's little other reason to buy Reflex, and I would argue that the vast majority of people who cared to do so either purchased or played the game sometime in the past 2+ years, especially since no one really saw Reflex coming until it was announced. Bioshock, which was much less of a sensation than Modern Warfare, was only out for one year, and a PS3 release was heavily rumored (hoped for?) almost from the beginning.
It's not a perfect analogy, but it's far from imperfect.