What I would do it give it an update, but I wouldn't chop everything off.
I like the idea that someone said about it being optional. Running with that, I would say have a text box for an overall review and a 1-10 drop down box next to it. Below that will be a series of optional text boxes for those who wish to go deeper than the overall and analyze the flash more with preset [or user created?] categories plus their drop down boxes.
You know how video games are sort of rated and it is broken up into categories? For Sound, Graphics, Gameplay, Replay Value. Have something similiar for that and then when it actually posts have it segregate the sections having maybe their own little boxes around them or something. For convinience. Thing about user created names their is the fear of abus and making a category like "Crappiness: 10".
Hey it is your call, but I have no problems at all with the current review system, if you eager to change it I hope you take into account the ideas I put out. I just think that you should allow reviews to go more in depth with their reviews than limiting them.