Things I like: Weapon Masteries, All Feats are now Half Feats, some general re-tuning of classes/subclasses that were underperforming.
Things I dislike: the homogenization of subclasses (makes no sense for Sorcerers & Warlocks to get their subclasses at level 3), some general lack of polish on spells/features (do a google search for Conjure Minor Elementals)
Just to name the stuff immediately on my mind, could probably name some other stuff (in both categories) if I spent more time thinking about it