Rounabouts work o.k. in u.k. when the quantity of traffic on the two roads are similar. When they are not,the traffic on the lower-volume traffic road get a raw deal.
I just love it at mini-roundabouts when there are drivers at each roundabout entrance simultneously. In England,everyone waits for everyone,usually. A great entertainment for cyclists.
Also entertaining are those drivers ready to drive onto the roundabout who just sit there waiting for...........I wish I knew what;certainly nothing obvious. (Permission? No drivers for miles?)