So far, I am liking the Morality mechanic, but I only plan to use it in relation to my Force-sensitive in the party. The primary reason has to do with how the force narratively obeys actions, but also guides. If someone is falling to the dark side, then the dark side of the force also takes its toll on the player. I don't see this as moderating behaviour, as a PC could legitimately choose to go dark side altogether. While I still have to get my hands on it, the Morality mechanic from FaD at least puts a spectrum up where a player can see where they are at.
After all, one cannot expect to play a character based on Obi-Wan and still be an outright murder hobo.
I think the interesting piece with this, is unlike either WEG or WotC's versions, someone who falls to the Dark Side doesn't automatically become an NPC.