Mmm yeah, I went to a Detroit show in 08, and although it was a great performance (my GF at the time was with me, she doesn't like STP, but she thought it was a good good gig) I did get a strange feeling from it, like they weren't quite all there.
It was when Scott had that idiotic looking long haircut, and he just seemed a bit zonked in between tracks, and the whole band seemed a bit standoffish. But then I saw them again in London UK for the S/T tour, and they were amazing. Almost as good as when I saw them at the same venue for the SLDD tour. They seemed to be getting on great, although that may have had something to do with the fact that the band apparently love playing Brixton Academy because all the fans know all the new tracks, and when they only visit once a decade they get a mindblowing reception.