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You could find plenty, but people who love NV over FO3 cry about FO3 endlessly and nitpick nonstop. Fans of FO3 over NV don't do the same, which is obsess over a thing they dislike. The purist fans want any reason to complain, so they do.
Almost every criticism I read of Fallout 3 goes well above and beyond "nitpicking." Nitpicking would be if people said FO3 was shit because it didn't have iron sights and because it had goofy physics, not if they criticised things which are actually supposed to be critical parts of the game, such as its dialogue or storyline. Pointing out that the game's got more plot holes than the moon isn't a nitpick, same with criticising a game with such a serious tone for having dialogue that was clearly written by kids.