That arkansaw one is good, in UK when you give directions you would say "go straight over at the roundabout" i guess they took it literally.
As the french guy said before, they work well in low/medium traffic but in high traffic they are useless and have to have traffic lights or people wanting to merge from lesser used roads get stuck waiting for ages as the high traffic users use the car in front as a shield to stop you merging.
I'll give the top 3 i hate in my area with google maps links.
Cooper dean roundabout
Too many lanes and merges, at peak times i've had some close calls on this.
Christchurch main
I ****ing hate this one, people coming from the right all the time and the traffic lights to stop them only work when a bus needs to go around. as you can see there a load of trees on it (becoming more common now) so visibility is gone and you can't see the other side of the roundabout -_-
Mountbatten roundabout
Don't go here very often but dread having to do it, multiple lanes, loads of traffic lights, and the thing is split into sections with their own lights. As stupid as it is, it works and is a sort of compromise to deal with peak times, but you have to watch out for new users as i've had close calls when they don't know the lane system.