I saw it, and she was appalling, but since it's only a few days ago that she was hospitalised with suspected emphysema, I forgive her. Though personally I think it would have been wiser to cancel her gigs this weekend.
She may have been terrible, but she was sporting the biggest beehive in history, which I applaud.
I worship the divas you mentioned, and I do rate her right up there with them, and she most certainly can sing live, as can be seen from her appearance at Glastonbury last year.