There was an academic scandal with Prof. Das photo-shopping western blots. My guess is that it has hurt retail sales of res, but that doesn't seem to have effected most of the other research.
Resveratrol does some fairly amazing stuff in animal studies (almost doubling mice endurance), but it hasn't been proven to carry over to humans yet.
I don't take it, but it seems to be one of the promising supplements. I still consider it worth watching. The latest thinking is that you need to take a fairly significant dose to get results (I'm sure that the retailers enjoy this thinking.)