From what I can gather, that was the point.
If you look at wizards, the power curve for 3.5 was exponential. They start out absurdly weak, then ramp up rapidly in power until by the end they're altering the substance of the universe five times before breakfast. Fighters start out mostly weak, then ramp up in power... until they hit level 6/7 then they sort of plateau.
What they're doing is starting all the classes out stronger and making them gain power more slowly, so that instead of an exponential growth you get a more linear growth. That way you still end up quite powerful, but not game-breakingly powerful at any time.
If you look at wizards, the power curve for 3.5 was exponential. They start out absurdly weak, then ramp up rapidly in power until by the end they're altering the substance of the universe five times before breakfast. Fighters start out mostly weak, then ramp up in power... until they hit level 6/7 then they sort of plateau.
What they're doing is starting all the classes out stronger and making them gain power more slowly, so that instead of an exponential growth you get a more linear growth. That way you still end up quite powerful, but not game-breakingly powerful at any time.