I think a large part of the ire is that the ability to overturn the block/charge can only happen in a specific situation (last 2 minutes and review is for whether or not the defender is in the charge circle) and is brand new this year (maybe last year as well). What seems like a good idea in isolation (get the call right) becomes horrible in practice precisely because so many other things cannot be so corrected, like the Hill call in overtime. And block/charge is always maddening.
J.R. Smith (and George Hill!) loves this distraction, btw. As do the shooters that went 3-17 from 3, mostly wide open, on passes from LeBron. And Durant is happy that his generally crappy game, including a failure to box out on the Hill free throw and pretty wretched defense, is overlooked.