1) It's not a lifestyle firm, that's for sure. But you won't find that in NYC. Seriously. Relative to other firms, I don't think it's any worse. Note that lititgation is broken up inot practice groups (and I urge you to think about which one you want before you get there). Gen Lit has the unhappiest associates, but good exit options. It's also where most litigation summers end up. White Collar seemed generally happy, and have good exit options, but it's very competitive to get into. Mass Torts, I didn't hear anything bad about. Antitrust (the lit side) does a lot of sports stuff and seemed good, though limited exit options and also competitive. IP/Patent sounded good, but also very competitve. Really, your QOL will depend a lot more on your practice group (and more specifically, your partners). Ask associates in your practice group who the bad partners are and avoid them early on.
2) Again, this really depends on practice group, but I found the partners to be super approachable and very respectful. I summered at another firm and the Skadden partners were much different (in a good way). I heard of a couple "yellers" but associates seemed to be happy with their partners, for the most part.
3) Name, exit options, awesome summer program.