I've seen Bob Dylan numerous times over the years and I'm glad about that. Sadly the last time I saw him, a few years ago in Manchester, it wasn't so great. His voice has gone to such an extent that I had trouble recognising some of the songs until he was halfway through. I still found it a wonderful occasion although my beloved, not a Bob Dylan fan, found it truly dreadful.
Having said that I think his recent stuff is still extremely listenable as he seems to have written it to suit his voice. As he approaches his seventieth birthday it is inevitable that his voice is a little rocky, he's been touring virtually non stop for decades, which must have taken a toll.