For awhile, they were getting very bad reviews and many complaints. Disney forced them to clean up their act awhile ago though.
I went last year for lunch and it was very good. It had just opened up for the day (11:30am reservation), so it was still quiet and service was great. Ordered the Sopa Azteca, Ribeye Tacos (which don't appear to be on the menu anymore), and some delicous White Chocolate Mousse dessert thingy.
I'll be heading back there again in Sept as well and it's one of the 17 places I'm really looking forward to! (Ok, I'm going to 17 different restaurants... and looking forward to them all, but that's beside the point).