Good, but nothing special.
PROS: New "Mental mini-games" are neat.
Better course selection including Riviera, TPC Boston, and Doral. New confidence system effects the skills of your golfer. Minor graphical improvements (mostly more trees and a gallery of spectators.)
Improved putting system. (Uses CPU's estimates to help caddy your putts.)
CONS:
The presentation is EXACTLY the same as last years, (game menus, commentary, graphics.)
The putting system undermines the difficulty of putting in most cases. Nothing new to do with the GameFace mode. It seems directly ported from the last 2 games.
THE BOTTOM LINE:
I recommend waiting to buy this game when the price drops. But if you absolutely need new courses and trophies to unlock, then by all means you can't go wrong with this game.
(PS: I never tested this game online via Infrastructure or AD HOC.)