I've heard that kinda playing you talked about where the hands are not co-ordinated....that takes practice....most amature guitarists seem to do it to that to show that they can do sweeps and fast alternate picking solos before they have really mastered them.
You can listen to almost any live album from any band or soloist and find moments where they sound crap....but its all part of it sometimes....when Guitarist magazine did a review of Led Zep's BBC sessions ages ago they said: 'Sometimes Jimmy Page's playing sounds awful....but who cares?'
In the studio many people can alter things to get them perfect, even if its just removing a bit of fuz from a bum note....when you hear someone play live THEN you get the real guitarist.
'There's no such thing as bad weather, there's only the wrong clothes...'