It could be argued, as I already did somewhere else, that the splinter faction in Tactics isn't an entirely inconsistent perspective on the original Brotherhood of Steel. There were some instances in the original Fallout where Maxson himself didn't seem to be that happy with the Elder's points of view, and in Fallout 2 it is said by a Brotherhood of Steel member that they are no longer as powerful as they once were. It's not a terribly complex exercise to imagine some reasons for a falling out, nor a consequence to those divergences of opinion leading to what we found in Tactics, so as a complaint, it's not very strong.
But pointing out that the appearance of fully-functioning fossil fuel powered vehicles and installations doesn't exactly jive well in a setting where the world went to war because there was no fossil fuel to go around isn't exactly vague, and neither is pointing out that Deathclaws were a highly mutated form of chamaleons and not a furry amalgam of different species which could be mind-controlled by wasteland beastmen.
Fanatics or not, most people that took those issues to heart have explained in-depth why they believe their portrayal wasn't accurate. And it's their decision to take those non-cannon situations as they want to. I'm sure there are some who take it upon themselves to not let those poorly handled elements affect their enjoyment of the game (ie, bask upon the glory of CrashGirl's kindergarten-styled "lolz furry!" dismissal of that particular point), but gamers who enjoyed Fallout for its (mostly) well developed and internally coherent setting probably won't be as accepting. Or are we trying to blame them for not appreciating games in the same way we do? Because y'know, that would make sense!