People are not used to roundabouts in America. I lived in place where a whole residential area (i.e. very light traffic, low speed limit, school zones) used roundabouts instead of stop signs. Almost every other time I've seen another car on a roundabout it's been making a left turn by driving clockwise (in America people normally drive on the right side of the road so you need to drive counterclockwise). On a more lively roundabout that was on my way to a freeway I had to be very careful as a significant number of merging cars believed they have a right of way. If there had been a way from my home that did not have a roundabout I'd rather use that because roundabouts were really scary.

New England has a lot of the old, non-modern roundabout (which this article is talking about but doesn't really distinguish from traditional roundabouts/traffic circles/rotaries).

Boston may have a few that aren't completely Euclidian.

Same in NZ - after living in Canada for nearly 8 years, just returned back to NZ. I love roundabouts... far quicker getting round town, you're not constantly having to do these infuriating 4 way stops everywhere.

Agreed, they're simple to use, even the 2 lane varieties.

I think the problem is as mentioned, often American ones are much different. It seems more like a free for all circle with a random bunch of roads exiting and entering, with no lanes marked. Also construction obscured the view to the left.

I did come across a few "normal" roundabouts at least, but they either don't exist or are terrible.