I'm fairly harsh towards GW's rules, but I must say that I'm very impressed with the WFB 8th ed. book. the rules are explained in a very easy to read way. The humor is very aprreciated also. While I haven't any WTF moment for now, I'm sure there will be a problem or two. After all GW games are very "opened" to unusual situation as opposed, say, to chess.
I must say that we've discussed the random terrain rules and I insisted to used them. Terrain has a lot of influence on the game depending on your army. As a lizardmen player, I always used to get those "Yeah, nice try" when adding water features. So now, it's up to the random table!