I actually found this site not too long ago and started using it as well. While I don't think it is gonna solve all your problems, I do find myself checking it day to day and that at least slightly motivates me to accomplish something... Kinda like having a grocery list of things to do (That's exactly what it is really), every time you look at it, it's like a little push to go do it.
I've actually spent a lot more time pushing myself to compose since I joined the site, if for no other reason but to gain a little more xp/gold/gear in HabitRPG.
The only real issue with the site, as with any motivational helper/tracker/whatever, is that the user really has to be able to exercise a great deal of will power to keep up with it. Seeing as the site obviously can't magically tell if you actually did something or not, it really falls on the user to be honest with themselves, instead of clicking off things they didn't actually do just to avoid losing some health on the site.
If you have the will power and can be honest with yourself though, and have a real desire to build better habits, then I think it's an awesome tool.
Wish I could actually "gamify" my life... I'd love to see an achievement pop up every time I created a new song or something.