For the most part, the slots at Foxwoods suck.
But there are a couple that I have been playing lately… in the Grand Pequot casino there are 3 machines called Wild Wrangler which have a cool bonus round that has the potential for some big wins (as well as garbage). These are between the Cash Fever progressives and the Hot Shot progressives near the cashier cages. The side facing the Cash Fever games has two of these machines, and the other side has one, right next to Queen of the Carnival which is also sometimes good but has been downright shitty lately (not a single bonus round to be had).