[ippisl]

Remember, the people giving the reviews are stanford students. They are much better academically, and are used to much tougher courses than you're average college student.

On the other hand, i've seen a review from somebody in kenya i think, that said that those online courses are much much better than university courses offered in his country.

Also there are varying levels of difficulty at coursera,MITx and udacity. Someone in this thread said MITx course was challenging. So we still have to see if courses are challenging and to whom.