I think that innovation has been a good thing for him in retrospect, because in my opinion, his style of storytelling and instrumentation is rather unique and his songs, sad though they may be, as a result tend to have a fresher, more interesting sound that sets them apart from most of his contemporaries. As a result, he doesn't really blend in like most of the other major artists of the time.
I would say that because of this, perhaps he was a bit ahead of his time, and thus somewhat under-appreciated during his (tragically short) lifetime.
c