> drop off rates are extremely high for MOOCs.

I see this statistic tossed around quite a lot.

Maybe it's because many MOOCs require you (or at least urge you) to login and officially "enroll" in their course to see the content.

Many times I've been just looking around a MOOC out of curiosity, but I'm required to "enroll" in it in order to see the material. So I login, "enroll", take a quick look at the content and forget about it.

It's not necessarily a fault of the MOOC format.