Pooh Bear
It would be nice if there were more roundabouts here. The problem is that people here don't know the difference between a traffic-circle and a roundabout (traffic circles have the asinine ROW rule where entering traffic has priority over in-circle traffic). This has resulted in a general opposition to roundabouts because of the bad connotation that traffic circles have.
Traffic engineers here are also wary of building multilane versions of them designed for higher speeds because of their preconceptions that drivers here are not capable of handling them. The only roundabout that I have first hand experience with cannot be negotiated at more than 15 mph (really tight radius).
I have also observed that most drivers more or less deal with roundabouts in a correct way. I have also observed drivers approaching a roundabout and switch on their *left* turn signal (why?). Those same drivers stop despite the fact that there's no traffic to yield to.
Other times, while in the roundabout, I've had a few problems with drivers failing to yield to me (though I suspect that problem also exists in the UK to some extent).
But, if roundabouts were more widespread, then I suspect that most of these problems will go away.