"I've previously been chewed out on this board for expressing my negative feelings about Mazzie's performance in Next to Normal, but, since you asked, I'll share my opinion again."
You should never hesitate to express your honest opinions here, especially not if you support them -- or, rather, TRY to support them. But, of course, no one else should hesitate in expressing complete and total disagreement with your assessment. I do appreciate your explanation of what you found lacking in Mazzie's perfomance, but FWIW, I strongly disagree with every opinion you expressed.
That said, we should consider that it's likely you and I did not attend the same performances of NEXT TO NORMAL with Mazzie and with RIpley, and that might possibly account (or partly account) for our widely varying opinions. For example, I absolutely DO NOT remember Mazzie playing the one-note emotion of "sad" throughout the show, but maybe you saw one of her first performances when she was still working out the character, and maybe I saw her a few days later when she had come upon a different approach? As for Ripley, maybe you saw her on a night when her singing wasn't so raw and so variable in pitch that it wasn't difficult to listen to and didn't repeatedly take you out of the show.