A few weeks ago, Scott Weiland received a TON of criticism for an absolutely terrible performance of 'Vaseline'. Admittedly, some of it came from me. It was bad, and a lot of people accused him of being back on heroin. (I didn't, I thought being on drugs might have helped him.)
Weiland could have CRUSHED at Rock on the Range to show that his 'monitor problems and tiredness' excuse had any merit. Unfortunately, he sounds pretty much the same. Check out the video, especially when he gets into 'Vaseline'.