1. I think centerline hazards in the drive zone off the tee drive make most golfers uncomfortable. (Just played a hole like this today and my home course has one as well. They don't know what to do! Q: "Where do I aim?" A: "Pick a side, or aim down the middle and hope you dont hit it straight!")
2. Greenside bunkers that are set 10 yards off the green. They are great for maintenance crews because you can get bigger mowers in there to take care of the rough, but I hate that mid-range bunker shot!
3. Slow greens kill me. I just switched from a custom short putter to a belly putter because I am not good putting from long distance. PS: worked great today, even on slowish greens!