I've taken 3 Coursera courses. I enjoyed all of them, and learned a lot (but they also required a lot of work). Here are my reviews of them:

Introduction to Databases: http://henrikwarne.com/2011/12/18/introduction-to-databases-...

Algorithms part 1: http://henrikwarne.com/2012/05/08/coursera-algorithms-course...

Algorithms part 2: http://henrikwarne.com/2013/02/18/coursera-algorithms-course...