I've never had trouble with them, but I have seen some ridiculous driving around them.
Hahaha about the opposition. They wanted to build a new one near here, and a bunch of old people who lived nearby got it killed by claiming it would "be too hard for senior drivers to figure out how to navigate". My thought at the time was, "if you're too dumb to be able to use a roundabout, perhaps it's time to hang up the keys".