Matt:
A property doesn't have to be flat to make a reversible routing work, but it's a lot easier that way. A hole with a steady tilt can be played successfully in both directions, too. Lots of rises which might make the hole blind in one direction are the thing to be avoided.
It's a shame to see that the developers of this course aren't actually using the reversible feature. That is one of the main drawbacks -- to make a successful reversible course you have to have some holes in each direction which people want to play, so essentially that means you're giving up some of the best holes no matter which way you play it. Most architects are conditioned to use all the best holes they can find for one direction, and if you do that, then nobody will want to play it backwards.
Jeff D:
I think the best sort of hazard for one of these courses would be a sand mound, or a mounded hazard with bunkers stuck into either side.