I'm sorry if this is mean, I certainly do not mean it to be personal, just my observation, but...
The verse was playing and I thought "this is a high school band, no energy, vocals that probably sounded good in the rehearsal hall but don't translate into a live setting..." then Jeff stopped, went back, and the energy picked up tenfold during the instrumental section. I think there's something to that, honestly.
As for Burn, I know that song inside and out - performed it on stage myself, in the Jeff Scott Soto role - and, well, I've seen it done better (though not, alas, by me or my band). I get that Ron isn't singing a full set (though he did with Asia, did he not?) but his spots are on key and in time (if not mixed high enough). I would have expected better from Jeff.
(And nothing screams "ROCK GODS!" than flipping down your reading glasses, ala Derek at about 2:44.
. I say that to be funny, not petty or critical, as it has no bearing whatsoever on the performance itself.)