Yes these rankings matter. If you want to do health law in St. Louis, MO... this seems like a great opportunity, especially if you have previous health care experience.
Is SLU the top school to attend if you have no previous experience and expect to make 160k in New York? Nope
Specialty rankings are rankings per specialty; the only problem is that most people on this website seem to be obsessed with exclusively doing electronic discovery for the first five years of their career for obscene amounts of money. To be a drone, it apparently requires a good school and at the very least a high ranking at a "decent" school.