I actually hadn't heard a lot about this production but two of the most acclaimed plays currently running (based on the opinions of these boards) are:
Good People
The Normal Heart
But it really depends on your tastes. If seeing Robin Williams is important to you, then see it!
If we're not having fun, then why are we doing it?
These are DISCUSSION boards, not mutual admiration boards. Discussion only occurs when we are willing to hear what others are thinking, regardless of whether it is alignment to our own thoughts.