I was only there once. I had the most perfectly medicore meal of my entire life. It was a perfect 5.00000000 out of 10. :-) There was nothing wrong with it at all--except a real dingbat server.
My joke about Tree is that it's a great "break-up" restaurant. Your miserable time breaking up won't interfere with enjoying great food. You wouldn't want to waste a great meal at Le Bernardin or Gramercy Tavern by having a miserable time. Tree: the food's not bad, but it's so unmemorable that you can focus on whatever it is that you're also doing at dinner.
That's probably not entirely fair to them. But I also feel no compelling reason to go back. Unless, well, you know...