Still don't have any here, and people still refer to traffic circles as roundabouts. I've driven through a few over the years, and they're ridiculously simple: decide where you're going, find the arrow on the sign that points where you're going, and yield to traffic already in the roundabout.
Yes, the real problem is American drivers. There's also a simple solution to that: retest everyone with stringent standards, give the top 30% of drivers special plates that give them exclusive access to the left/fast lane on highways, limit the next 50% to whatever lanes are left, and summarily execute the bottom 20% (or just revoke their licenses.)
But in all seriousness (the top 30% getting their own lane is serious,) saying "American drivers suck, they'll never understand roundabouts" is bullshit. Educate people on how they work and they'll figure it out. I've seen examples of videos and full-page newspaper ads explaining how major highway redesigns will work, they can work for roundabouts. In the meantime, enjoy the lower injury rate and reduced severity of accidents for drivers in the roundabouts.
And don't do this in areas where there aren't lights and striped arms for rail crossings