Half the games you mentioned (Halo 2, Doom 3, Grand Theft Auto IV) aren't even widely regarded by their own fanbases, let alone by the general populace. In fact, I'm pretty sure each is considered the worst of their own series, though to be fair, most Grand Theft Auto fans thought the series started with Grand Theft Auto III. I'm sure it makes sense to some of them. Tomb Raider was barely taken seriously at large to begin with, and is more or less a dead horse at this point, because its gimmicks don't make it unique anymore. You're not even aiming in the right direction, for the most part.
That out of the way, many games are widely praised because it invoked a specific reaction in the player; the game rarely has to be particularly good in order to achieve this. Since it's on your little list, Knights of the Old Republic is a broken, buggy, unfinished, clumsy, ham-fisted, pretentious mess, but it still evoked a certain reaction from people, and thus they're willing (more than willing, apparently) to overlook all of that, assuming they even noticed it to begin with. I personally just swore a lot at the broken combat (and its horrendous, dated rule set), the joke of a morality system ("be a paragon of virtue even against reason or a huge asshole for none whatsoever, or be statistically punished!"), the ridiculous plot, and the abysmal pacing, m'self.
My personal whining aside, yeah, most widely praised games are overrated, because that reaction they invoked, whatever it was, caused them to overlook the game's flaws, of which there are usually many. In a way, this is a good thing (should we not focus on what we liked more than what we arguably should not?), but its fans also tend to be, well, insufferable because people feel the need to justify themselves through the things they enjoy, making the game, or anything else for that matter, that much less likeable to those of us who just didn't care for it.
Lastly, I can't really see why the original post was flagged other than that most people can't emotionally deal with someone criticizing something they li-... Oh.
Still, it'd be nice if the grounds were beyond that. Your second post in the topic certainly qualified you as acting like a prick, sure, but that one didn't get flagged.