FYI, LaCage -- Barnes also gave Rabbit Hole Two Stars, "But once that story is made clear, it's also clear he has no idea where to go with it. It's as though Dr. Phil had decided to write a feel-better play." :
http://www.nypost.com/theatre/62818.htm He was also the only major critic who didn't like Well, so I think Barnes's opinion has to be discounted when discussing Best Play this year.
History Boys and Well are the two best-reviewed plays of the season thus far (amassing all raves save for Barnes). Rabbit Hole split the critical community down the middle -- half loved it, half (Post, Daily News, Newsday, Reuters, Bloomberg, Broadway.com, All That Chat et al) found it a soap opera. Inishmore will also likely get better reviews than Rabbit Hole when it opens.
While the critical response is not the sole determinant of how well a show will do with the Tony nominators and voters, it has a HUGE influence. So far, History Boys and Well have to be seen as the frontrunners.
"What a story........ everything but the bloodhounds snappin' at her rear end." -- Birdie
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"The Devil Be Hittin' Me" -- Whitney