Our very own red/green color blind Ben Gilbert, who doesn't have a particular issue with MW2's spectrum decisions, noted, "I can think of about 20 other games that need a solution for this before MW2. How about every puzzle game ever made that depends on color matching -- I'm looking at you especially, Super Puzzle Fighter, you heart breaker."
Considering color blindness is relatively common, especially among males, it's surprising that it isn't tested for more regularly. Any QA folks who can give better insight into whether color blindness is tested for (and how) should feel free to drop a note in the comments.
[Via Escapist, Evil Avatar]