Love them! Just got back to the US after driving around Portugal and Spain. I especially love the ones that replace what would typically be a string of 4 way stops with traffic lights. It is great, especially when there’s no traffic, to be constantly moving rather than stopping, waiting, and starting. Also, can’t complain about the huge (well studied and documented) impact on safety.
Edit: Also, I hate traffic circles! My wife and I use the 4 way stop, traffic circles, and roundabouts as analogies of different types of solutions. Roundabouts are the ideal solution (saves lives, land, $$, etc.), 4 way stops are less than ideal solutions that work, and traffic circles are the worst of both worlds.
Have they outlawed people making fun of people that wear shoes with lifts in them yet?