They are about as human as a brick. I prefer the two dimensional humanoid characters in Links. The courses are well defined which make them realistic in the playability sense but they still look awfully cartoony even at the highest resolution. Backgrounds look as good as other games though. Announcer's commentary often doesn't match what's happening - especially on the greens.
Ambient sounds are pretty good though.
This is the best golf game I have played on any type of gaming pc or platform. I love the ability to download courses of the net. The gameplay is great. It's almost as good as going out and playing real golf at the course and less frustrating. The graphics are sweet.