I like the idea of different schools to learn different tricks. That seems to be the way the game is going. I think about half the classes have some level of customization beyond just the standard set of skills given.

I'm not sure what the purpose of the "belt" system would be. I guess similar to the way assassin kicks work now, where perfecting certain skills gives access to new ones. I hate that mechanic, but I guess it works.

Really though, I think there are a few other classes that would need a revamp before assassins. Shamen being the most obvious one.