Yeah. Neurology is a science, and practiced properly is dependable. But that doesn't stop some random quack from calling himself a neurologist and claiming to treat brain problems with flashlights. How very weird...
A decent neurologist will first determine how your brain works, and whether you have any weaknesses; and then, if you do have problems, he'll prescribe treatments--usually medication or therapy, but occasionally surgery in some cases, like if he discovers there's a tumor or an aneurysm or something, or severe intractable seizures. The sort of testing a neurologist will do is anywhere from brain scans to simple tasks like putting pegs in holes or squeezing a machine that measures your hand strength. All depends on what your symptoms are and what you need treatment for.
Neurology is a branch of medicine and is as evidence-based as any sort of medicine is. There are incompetent, unethical, and ignorant doctors; neurologists are no different. But there are also some very capable ones. If you get an incompetent one, then just find a second opinion.