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I think it depends greatly on the chiropractor. Some use good evidence based procedures and would be similar to a physio type person.

Others though base their practice on the idea that every malady is a result of vertebral subluxation of the spine, including flu, infections, chicken pox, whatever you can possibly get (basically ignoring germ theory), to the point that they recommend to their clients to NOT vaccinate their children and such. Anytime they start throwing terms around like "Big Medicine" and "Big Pharma", start to look deeper.

I knew one personally that was a complete quack.. he went through all their programs and was up to date, but he was one of the most magically thinking people I've ever known. I remember once where he was telling a group of people that cable companies can actually watch you through the cable system. I prefer a bit more rationality in my medical practitioners (not saying all are like that).