I don't use wiki as primary study material, but it is very useful for looking up specific details. For example if I see an enzyme that I don't remember, it's much more efficient to look it up on wikipedia than look it up through an index in the back of a textbook. I wouldn't study pathology using wikipedia due to reasons listed above; the material isn't uniformly compiled and integrated into a high-yield, easily understandable, and memory-inducing format.
Regarding accuracy; a lot of medical students have delusions of becoming inexhaustible sources of impregnable knowledge, so the response is to disregard wikipedia due to its being user-created. Many sources have some sort of errata (First Aid, Rapid Review, etc all have numerous mistakes) and imo wiki is as credible as any of them. Remember the articles in your school's library may be dated, discredited, and biased as well. Medical textbooks are often outdated as soon as they print. The goal of knowing everything perfectly is flawed.
I wouldn't use WP as primary study material or clinical reference (up-to-date is so much better..) but I have no problem using it to review the enzymes in a biochem pathway or the mechanism of a brand new drug.