Adrian,
Kingsbarns is the only one I have played, and I did not find them to be too severe. I think this is due to clever visual shaping and that the approaches and tie ins don't have as many of the smaller, wilder landforms you find on the natural links. I had a fair amount of 3 putts, but it wasn't the shaping but rather that the wind was strong enough to move my backswing. I had a putt on the back of the 14th--slight downslope and about 6" break to the right. I hit it extra hard and about 2' left, and I swear to you the thing was coming back to me slightly as it trickled in. I hate sharing shot stories, but that was a new sort of achievement for me you could only pull off on the most exposed corners of the links.