"mostly" snake oil. some adjustments help some people some of the time. chiropracty isn't a real medical degree, it's an academic degree.
Why do all chiropractors refer to themselves as "Dr." followed by their first name. Like "Hi there! I am Dr. Dan! Let me teach you about how to lose weight via the treatment of cervical subluxations!"
As a professional science fellow, I view chiropractic interventions are being highly subjective, non-reproducible, and non-quantifiable. While people can try to argue the same is true about traditional medicine, until these same people can explain to me the purpose of a microsomal stability assay or how LC/MS can be used to determine PK rates, then these people are likely trying to talk about things they don't actually understand.
All that being said, I am not going to say one won't feel better after a chiropractic adjustment... I'd just prefer people are real with themselves about that fact that Chiro practices are not actually rooted in any real science nor real medicine... and more importantly, understand there's no real oversight or standards about the quality of care they receive.