Well, for your own benefit, it is never wise to write a bad review for your own program. If you are already in a program that you think wasted your time, then it becomes your sunk cost, which doesn't matter to you in the future. What you want to do is maximize your benefits in the future for your own good by improving yourself in other ways. Write a bad review certainly wont help at all. I am in a top 5 program according to this ranking, and this program is way below my expectation, but the least thing I want to do is to write a negative review about it, because I still want it to be favorable by potential employers.