I've sat in the rear mezz at the O'Neill, Walter Kerr, Studio 54, and City Center,
The Eugene O'Neill and Walter Kerr were fine, especially the Walter Kerr. It's very steep so I had a wonderful view.
As others have mentioned, Studio 54's rear mezz has a fine view, but it is very, very cramped.
I know people don't like the rear mezz at City Center, but I had no problems with it. Of course, I was sitting in the front of the rear mezz, so it may have been different if I were sitting further back.
I am a firm believer in serendipity- all the random pieces coming together in one wonderful moment, when suddenly you see what their purpose was all along.