I'm pretty sure the bitching will come whether it's good or not.But in any case, I think we can all agree that the most important thing is for the story of the 50th to be good. Cause I think only if it ISN'T, will the bitching will come about from all fronts.
If the Hurt Doctor ended the Time War only people who were already going to bitch will do so. Otherwise, so long as the episode is good, no one else will care.