I found/find her whole drunk schtick to be tiresome, cynical and totally calculated. That said, Back to Black has become a serious guilty pleasure, and I've probably listened to it a hundred times in the last 2 weeks.
Last Friday, I was in New Orleans at a fairly crowded bar playing pool. I programmed the jukebox to play the whole album, and about a dozen people came up at various times while it was playing asking, who is this?