Roundabouts can work very well, if there's not too much traffic around. The fact that you have to take account of other people, and not just follow the green light, when sing a roundabout can in fact encourage courtesy towards other road users, which is the most important driving quality of all.

But once the traffic builds up, the balance swings the other way. Harlow is a town with roundabouts on just about every junction, and they've been forced to put traffic lights on quite a few of them now, and thank God for that.