To answer the thread and not about her riffing,accent or whatever everyone is talking about I have seen Kerry 6 times when she was here on Broadway and I will say that I thoroughly enjoyed her 3 of those times. Of the 3 times I didn't care for her was her first night,one show she was REALLY sick(Katie Adams' was on as Glinda and it was Amanda Rose's first show as Nessa) and other time I really don't remember. The 3 times I did enjoy her was David Burnham's last show,Kerry's 2nd last show and her last show.
Her acting was top notch while on Broadway but she did have voice issues(I love her voice also).
Don't believe everything that you hear! Only the peeps involved know the truth!