Without a doubt, one of my top 3 restaurants of all time. Certainly the best Thai I've found in the state of Arizona.
The menu is large, diverse, though mildly pricey. If you're looking for Thai on a ramen budget, I recommend Thai Basil on University Dr. But if you've got $13 for an amazing Thai dinner, I suggest the Drunken Dragon noodles. Everything I've had here has been flavorful.
A note about spicy food: As Thai restaurants go, this one is on the hotter end. Though I typically order my food "Thai Hot" at other restaurants, I typically stick to "Very Hot" here because it's sooo hot. Just a note of caution :)
The service is occasionally at a slower pace than I would like, but I attribute this mostly to their crowds of customers rather than inefficiency.
Perhaps the best reason to go to Malee's for your first Thai meal? The staff are incredibly good at keeping your water glass full- a necessity when trying those spicy entrees.