They have certainly made Throwing Builds stronger.
I do like the changes they made from Traits to Backgrounds, and how skills have been simplified (But every class still gets 2 skill points or more). It looks like, for skill points, each class gets 2 skill points, Plus their regular skill points over 2 cut in half.
So, 2 + (X-2)/2. This makes fighters/Paladins/Wizards/Clerics and the like a bit stronger, because they lose no skill points.
Anyway, with the exception of Prestige classes, I’m keen on those level 20 abilities, so I’m always sticking with Single Class Characters.
Plus, I think you get extra hitpoints for favored class bonuses.