Fat Tuesday's is the place to go if you want sugary slushies that mess you up. I usually don't care for chains, but the Mill location is decent and has no cover. I've never experienced any problems with the staff like other people, but I wouldn't doubt that there are smart asses working there. Put them in place!
Drinks are average price, with the slushies being the specialty. Depending on the night they will have a DJ playing run of the mill top 40 crap, but it doesn't really interfere with your drinking. Crowd is a mix of ASU students and townies, depending on the time of year. Come with low expectations and leave happy!