Roundabouts - what's the point?

Can't stand them, especially when the directions signs are as useless as the ones in Milton Keyes. (incidentally - Milton Keynes - what's the point? Every time I've been there, it's been a disaster. Went to buy a dress in 1988, shops didn't have it in stock, had to get a bus to London - huge adventure for Little Smat From The Sticks; went to see The Doors at the cinema circa 1991, spent second half of the film desperately hoping Jim would get on with the dying so I could go to the loo, then friend's car broke down on the way home; today discovered the Triple Roundabout From (or possibly To) Hell. )
But DD1 enjoyed her Maths course, and I planned the Management assignment. And Milton Keynes is now a long long way away.