in terms of performance, the rolling thunder review stuff was great, as were his bits with the band in the last waltz.
but... i saw him live in about '93 or so. i actually went to see santana who opened up for dylan. santana was great as always (once you get past all the god-squad stuff), but dylan was incomprehensible. I remember turning to my bro and asking "this is all along the watchtower, right? i'm pretty sure this is all along the watchtower." we left 5 minutes later. total garbage.
i'm still a big fan, though. i love so many of his songs. i just think he never got past being a stoned teenager. both his personality and his performaces show that in spades.