I'll be a 3L at Pitt this year. [I'm busy working right now and needed a break, so I checked this board.]
I've had most of the professors listed thus far for at least one class. None are "Professor Kingsfield" types, but they are a bit rougher on the 1Ls than on the 2Ls and 3Ls (nothing too bad though). You'll receive mixed commentary from 2Ls and 3Ls about most of them.
Here's my commentary for a couple of the professors listed that I've had:
I would say that Burkoff is one of the most popular professors at the school. I took his ethics class, and I didn't look up at the clock once the entire semester. He's extremely engaging. I have heard good things about him from friends who had him for criminal law.
I had Flannery for legal writing. The workload is heavier (e.g. 2 open memos instead of one) and the subject matter more challenging (e.g. we wrote a memo assessing CERCLA liability while another section wrote something pertaining to dog bites) for his legal writing class than for the others, but most students who had him seemed to be thankful for it in the end. I really liked his class, but be prepared to be busy and start working on the large assignments once you receive them. Flannery is also extremely accessible and very helpful - particularly if you come into his office showing that you've put a lot of thought into a problem and have focused questions.