I did like the idea of your face changing as you fall to the dark side. It was a kind of nice touch.
But i do believe that it i too easy to switch from one side to the next.
I mean you brutally kill a peron to get some DS points, then you suddenly do a good deed and poof that evil act i suddenly gone.
Imo if u do something evil... instead of people asking you for help, as they would LS. They would fear you and beg for mercy, or favours. Hell the missions could be even more blood thirsty. And to regain LS points will require considerable skill in Charisma and Persuation, to choose the LSed option in that convo.