There's no better example of this than the Star Wars prequels. Objectively, those are some nightmarishly bad movies, provided your nightmares involve cartoon sidekicks and underacting Natalie Portmans, but people got very angry about them, and really, does anyone know why? What was it, exactly, that Lucas did to deserve anger? Short of the prequels being six hours of him having sex with all of our moms, there's no reason for it.
Fear leads to anger, anger leads to hastily typed forum posts and a meaningless life.
You get angry when someone does something to hurt you or someone/something you care about, not when someone fails to keep doing something you like. And the prequels don't actually hurt the original films. We didn't love Star Wars because we thought it was the beginning of a six-movie arc; we loved it because George "You're all clear, kid, now let's blow this thing and go home" Lucas was a young, energetic guy who, with a combination of luck and creativity, touched the hearts of literally millions of people across the world -- something that 99.99 percent of people never even come close to accomplishing. And our response is to get angry when he fails to do it a fourth time? What kind of borderline psychopathic bullshit is that? Even porn can't produce a boner every time, and that's basically considered to be a blue chip medium.
Modern cinema as we know it would not exist without him, but on the other hand, he screwed up later.