As a 2L, I have had contact with the Career Services people and I must admit that they aren't particularly helpful. Here is the deal, if you go in with specific questions or objectives, they may be able to help. However, if you go in as a 1L or as a 2L and ask them to help you find a job (which many would say is their job), you will likely be pretty disappointed. You are going to hear bad things about them when you get here, but keep an open mind. If you have a strategy, they might be able to help you out. Basically, they are like most everything in law school, not as bad as some people say, but definitely not that great either.
Also, the new Dean has tried to overhaul the Career Services Department and hopefully they will be improving in quality and stature in the near future.