are you serious they dont go in depth enough?? i thought the kaplan videos where the most in depht of all review courses..i think the kaplan videos are a waste of time as they do not going into enough depth to help you answer usmle questions. the usmle lecture videos i often mention are paul bolin's, but i recently found out about another great youtube channel by the university of louisville. the videos are free, so if you're interested, check out the links below...
University of Louisville