I get what you are saying but think you're being a tad extreme (more than a tad). If 3E isYes,then 4E is certainly not gangsta-rap. It might not even be Rush, but it could be something like Primus - spastic rock with elements of prog.
I'm exaggerating to make a point, to be sure- the gap between 3.X and 4Ed are not so great as that between classic Prog and hardcore gangsta rap- but the point remains: despite my having a decent overall opinion of 4Ed as a FRPG, it does not deliver to me (as has been phrased by others) that "D&D Experience."
(As for KC, I'm more a fan of Discipline and THRAK era stuff...)