Oh, you opened that can of worms...now let's see your list. In no particular order, the worst five shows that opened this month and I would kill myself if I had to sit through again:
The Notebook
Lempicka (though maybe I would be willing to sit through this again over Water for Elephants, but I just loved the acrobatics in that one)
The Wiz
Hells Kitchen
The Outsiders (tied with Suffs - both bored me into destructive thoughts, at least Suffs had a great opening and closing number)