Like most methods it won't be the be-all and end-all. Class, I don't think it will be much use for unless perhaps you can assign a numerical value to the various classes based on strength. There are too many wishy washy classes and combinations of classes to apply a figure to each change. As far as weighting each factor, that's just another loop in the program to try each factor at say 0.1, 0.2, ... 1.0 etc.
Fun to play with though.