Do you value your freelancers as much as your clients? I mean you can't have one without the other...correct? Why do you put so much "teeth" into clients' review while the freelancer has a simple 5 star tool with comment section? Believe it or not some clients are not professional, friendly or/and honest. Some want the world for nothing and no matter how fast you deliver, the quality of the work, the communication, etc. they are never satisfied. This really comes to light with the "value for the money" rating. Right from the start this is flawed as it is so subjective in nature. The fact that they hired me should imply that they felt my work/service is worth paying the price.
Your rating system creates a "power struggle" between the hardworking freelancer who make Fiverr successful and the client. The client has all of the power over the freelancer due to the rating system and their ability to just extend/cancel projects at will. It's obvious this is creating undue stress on many professional freelancers who are now wondering if they will see a significant drop in revenue when their 5 star reviews drop to 3. Same quality, same service, etc. but a new tool that seems to want to drive ratings down.
It will be interesting in 3 months from now (or sooner) when potential clients come to Fiverr and search for a professional (in my case Pro Voiceovers) and see a talent pool with low ratings (i.e. 1 to 3 stars). Are they really going to have confidence in our services? Will they be more likely to hire us? Time will tell.
I make a great income here on Fiverr and Fiverr benefits from this as well. However, I definitely concerned this will change everything.