And had you done that you would have been running out shrieking from a Tony Award winning revival with some great performances. 
As some have noted, using a sound byte here and there really doesn't always do justice.
Seeing the clips (from morning shows and the Tonys) wouldn't exactly have me thinking that Kelly was any different (or any better) than several Annas I've seen. You don't get the whole picture from a few clips.
And I will admit to being guilty of doing that. Having seen numerous clips of Kelly, I was surprised to see her take the Tony over Kristin, who I did see. And the latter was phenomenal in a role that was made for her.
Again though, you can't see things out of context like that and make a truly valid judgement.
As for Donna Murphy, had she been that bad (which she wasn't), I doubt they would have cast her.
But then again, the most recent King, I understand, is one who a good percentage of audience members have found almost unintelligible in his lines….so you never know. And that I would find very disconcerting, no matter how good an actor he is.