FU has a few things working for it. 1) You can't beat free for cost. 2) It's easy to read and understand quickly. 3) You truly can run any universe you like, if your imagination is broad and fluid.
There are a few things FU will need help with, if you play it. 4) It needs a lot of love and attention -- you will need more creativity than math skill, just like any other narrative rpg. 5) The rules need to have a little more "meat" on them, because they don't cover many instances of playing a game and sacrifice detail for efficiency. 6) FU basically has only one roll mechanic, which is only a good thing for experienced role-players who want to have less chance / game mechanics and more narrative / story-telling within their game sessions. 7) The artwork for the book is limited; it needs more "window dressing" - though the layout is functional and simply pleasant. The character sheet is a graphic design disaster; it's like driving an Edsel on the interstate. It needs to be redesigned to reflect the efficiency and simplicity of the game mechanics. (I am a professional graphic designer, so I designed my own sheets for my own game.)
The star rating pertains to providing broad information quickly to the general audience of how this game will appeal or not appeal; it should not only apply to narrative rpg players. It also reflects the cost (which helps immensely in this case). Unless you are entirely convinced that story-telling supersedes all game mechanics in rpgs, you will like this game system initially but later on, you will want the game to do more while remaining simple to play. If you like to "house rule" your games, and you are willing to take the time to do so with FU, then you will like this game for awhile longer.
[3 of 5 Stars!]