I'm probably the only one here with a verdict which is not influenced by simon and his media machinery.

When I heard about this old lady gaining millions of youtube views for just 2 days with people saying she's got the most beautiful voice, blah, blah blah, I resisted the urge to check her out coz I don't want to disappoint myself in the end. You see
when people say that compliment MOST BEAUTIFUL VOICE, I really take it seriously coz I have a very high standard being a musician myself. Only a few minutes ago my curiosity got the best of me so I watch her video... Guess what?
For an old lady she can definitely sing BUT NOT THE MOST BEAUTIFUL VOICE OR ONE OF THE BEST SINGERS IN THE WORLD! Give me a break Simon Cowell! 
Britain has got to be the easiest audience to please especially if they are out to prove something. Their I-can't-believe-this expression look soooo scripted to make Susan Boyle's perf standout. Anybody who's praising her to death must have never heard of Lea Salonga's version of the song I Dreamed Dream.
THis old lady's voice don't give me chills yet people compliment her like she's at par with Maestro Bocelli and Groban! I'm really pissed right now! 
I just proved a fact today; THE MOST BEAUTIFUL FEMALE VOICE HAS NOT BEEN BORN YET.
All the people who give her that compliment has never had the luxury of researching and listening to the best singers in the world, then and now, and
only have Simon's overrated talent shows to base what the art of singing is! 
I don't hate the old lady, It's the exagerrated praises that's getting on my nerves! Gosh, I think I'm gonna have a heart attack here....

PEACE.