I think if you want a Golf simulator, and have the patience to learn the mechanics of this game and how they work, you will love it. Folks that are looking for an arcade golf game, probably won't like it, and will quit before they give it a chance.
Personally I really like the game. Once you get used to the controls, it "feels" like you really are playing golf. You have to concentrate on each shot, and not every shot is perfect, some are really bad, sometimes you hit it perfect...but thats how it is when you really play. The point is, the feeling you get with the controller, is about like the feeling you would have really swinging the club, from the mental point of view.
I'm not sure of the specs of the reviews I see that say the game is not optimized or runs slow. It runs perfectly fine on my machine and the graphics look beautiful. Multiplayer works great also, a friend and I play together and take turns and it is quite fun.
The only cons I have is that there is no tutorial or practice area that I could find. It would be nice if they at least had a tutorial in game describing the controls, and a driving range that you could click on and practice swings. I think I eventually found this info on their website, but it was hard to find. Also, a bit of advice, if you are using a controller, make sure you have an Xbox based one, not the older D based (Sony) kind.
Final verdict in a nutshell - GREAT game, very much worth it, IF you put the time in to learn it properly.