Daniel Craig experienced the same fate when he was cast as James Bond because he had the audacity to be blond. We just screamed and screamed, until we actually saw him in the role.
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For some, the screaming hasn't stopped since.
And then there is Batman vs. Superman. Movie Batman has always hinged on the script and the director: The Dark Knight himself is literally nothing but a chin poking out of a latex suit and some alluring eye shadow everyone tries to ignore. With the right script, Alice Cooper could play the role. There's no reason why Ben "two Academy Awards and a recent string of great movies" Affleck can't. Even so, the second his casting was announced, the man had to put all his chairs on eBay thanks to the reaming he took from the Internet. I remember this because I was out there with the digital mob, mindlessly screaming into the void over the casting of this pretty boy actor who didn't fit the Batman movie playing in my head.
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"Say, that scenario sounds kind of familiar."