The buzz I've heard regarding this episode has been mostly negative. Truthfully, I don't get that. The only issues I saw were that the cuts they made were sloppy and the vocalizing at the end was kind of annoying. Other than that, a reasonably decent effort. Then again, I also think Colin Baker was just fine as the Sixth Doctor.
I just found the characters in the actual movie incredibly annoying, and the 'plot' was incredibly boring. Also, I was annoyed at Hercules getting over the death of his wife so quickly. I assumed he would be avenging her death but he forgot all about her as soon as Jayne Mansfield turned up. That was why I couldn't face going back to watch it a second time. The actual riffing was the only reason I managed to make it through to the end the first time!