I don't doubt there are some like that but many can spot the issues very easily. For instance, I'm very sensitive to framerate variations and can easily spot non-native resolutions. I can spot if a television is running TruMotion because of the uneven frame spacing and can spot the difference in motion between Plasma and LCD at a glance. Many people swear by plasma but I can tell the sets running at sub-1080p resolutions. I can also tell immediately if a game has mouse acceleration whereas the average user doesn't have a clue. I'm also sensitive to input lag and back in the days of CRT monitors could tell which monitors were running at low refresh rates, as CRTs running at 60Hz gave me headaches.
Many of these issues come to light because gamers who are sensitive to such things spots them. If you know what you're looking for these things are easy to spot. If you don't or aren't paying close attention then you can easily miss them or might simply not care.
60hz CRT's are easy to spot on the flickering though, specifically periphery vision flickering. and well in general it's not that hard to distinguish a 720 from a 1080 flat screen of any type, especially in games that won't have natural AA and therefore has fairly visible pixels with with FSAA applied. Plasma's advantage is the speed of the pixels ability to change from black-white-black(most LCD's are measure in black-grey-black because it's faster and most people won't notice the difference since they don't run in game mode anyway) at much higher speeds than any LCD. even the best LCD's today has at best a 400hz native, and that's measure in grey, even the cheapest plasma had 600hz black-white-black. But hey, I remember a kid playing doom on his greyscale laptop screen in school in the mid 90's or something... that was... something... kids today will never understand why there's a setting for mouse trails
as for mouse acceleration, I think the issue here is more about "do you care" than "do you notice". a lot don't care, or prefer to have acceleration on, for me... I can go either way, but if you ask people (and in some cases explain what it is) most will be able to notice if it's on.
in other related news, I can't believe this discussion is still going...