Actually, Singer did get flack, lol. If Singer had done X3, more than likely it would have at least bested out Ratner's take, and we also would have never gotten SR. Comic book films would have been better off this way.
And Nolan probably won't get too much backlash, but I imagine people will ask "why couldn't you just finish the trilogy so no one f**ked it up?".
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And Nolan doesn't have to answer, if he felt the series didn't need a trilogy and didn't want to do it, a sucky third film is not his problem. He could just say "I told you so".