OCW is really a mix of different things. It was originally pitched as bundles of resources that teachers could use to assemble courses based on an MIT curriculum. Pre-MOOC (and pre-ubiquitous video), it was not really intended to be packaged courses for a student to use directly. There were doubtless some political reasons for the original positioning, but in any case it means OCW courses are a bit of a mixed bag depending upon what someone is looking for.