Live albums in general are just not really authentic enough. Most are so doctored. It depends on the band, ya know? Dokken is laughable. I mean, George admitted to a buddy of mine at a clinic that the last live record was completely overdubbed vocally by Don, and George himself re-did a lot.
Then again, you have QR on the Empire tour -- they recorded three shows for LIVEcrime, and had two mistakes - Tate sang the wrong lyrics once, and Wilton broke a string once. Otherwise, they could have used any of the three shows recorded by themselves. I don't believe any overdubbing was done, they simply spliced together the best takes of all three nights to make one recording, and then mixed and mastered it correctly.
Fates Warning did the same on its recent live CD. No real overdubs, just picking out the best performances from the European run, and putting together the live release from that. That works.
Alter Bridge -- two shows recorded with an orchestra. They did the same as Fates and QR.
But then, you have stuff like Dokken, which unfortunately more the rule. Dream Theater -- how much did LaBrie go back and sing in the studio on all those live releases. My guess is -- quite a bit. Particularly on stuff that was just one or two shows. Score, etc. It happens, I get it, and I still respect the bands. But it makes "live," so inaccurate. Is Live and Dangerous REALLY live? I doubt it. I hope so, but I doubt it.
That's why if you get a bootleg that is extremely high quality -- that to me is LIVE, and worth its weight in gold.
/rant
Sorry about the random thought dump.