The things that do make WGT the most realistic are.... to me anyway...
1. The graphics. Most realistic views I've seen yet in a golf game
2. The continuing challenge of the game. Most golf video games get old quick because they get too easy too quick.
3. Continuation of #2 in a way.... Not every shot turns out the same... just as real golf.
4. Possibly only more realistic for me, I'm better off with long putts than short putts.
**Edit
As soon as I left this thread another reason popped into my head.
5. You actually need to take the time to learn what your clubs/ball choice can do as far as distance. Every other golf game I've played you could just use the distance the game told you that club would go.