I agree with that. I also agree that if you want a flawless Johanna interpretation might I suggest the obc?
Betsy might not be Sarah Rice, but her performance certainly is not detrimental to this stellar gem of a show that marked a theatrical turning point for most. One performer does not destroy the rest of the show, especially one like this, it only brings a new spin to the role. She was just as memorable as the rest on that stage. Her Johanna certainly was different and quirky.
Plus, maybe it just wasn't a great day for her. Have you checked Idina and Tonyas 2004 Tony award performances lately? Thats an example of 2 legendary actresses/shows/songs that are certainly theatrical standouts. However, they both didn't sound great that day, but does that mean they suck? No, things happen.
I'm sure if Betsy was horrible, she would not be on that stage. There was a reason for her being there and no matter how many people want to complain, people ALWAYS seem to find something intriguing about her. Maybe because you specifically did not find something good about her doesn't mean that her performance was a complete failure and ruined the show.