Although I don't think that the PhD program in lit is that well run, the Renaissance area of the UMass Amherst English department is really remarkable. It draws great students because there is an extremely well established Renaissance Center, directed by Arthur Kinney. Kinney is a top-notch scholar and he works well with students. He's also a pretty big name so a lot of other scholars in that subfield want to come to the department to work with him. You'll find a pretty engaged and like-minded group of peers and a really solid community, with a lot of events and stuff going on, a lot of lectures and scholars coming through, a fair amount of performances and a great place to work.
That said, I don't think much of the rest of the program. But if you are sure you want to pursue Renaissance literature and performance, you'll be well-suited in Amherst.