Yemen is a great shotgun map. Turbine is indeed crappy and boring.
I would have to disagree on you about Yemen on this with the shotgun. I hate it cuz everyone camps and with a shotty you won't have the range to get them before they get you. Now Turbine is great with a shotty, imo. Since it is a campfest and there are so many places to hide that you know where they are already. By far my best map with the shotty, always get 20+ kills running around.