What can be added to what has already been said about Joe's? This place is an institution, and is about the best you can get of "Arizona BBQ".
So why just 4 stars? Because so many of us are from other places, myself included. This place is paid the highest compliment when people from Texas (myself), the midwest, and the south all give it decent marks. My Texan tastes are pleased with the brisket, the sausage (which doesn't hold a candle to the sausage found in Elgin, TX), and the ribs. The sauce is pretty good, and the sides are good for what they are. You can't really mess up potatoes or mac and cheese.
That cornbread nearly takes this to 5 stars, but I can't give it on principle. Still, Joe, you are darn good for making me consider it.