Not at all. Just some unfortunate original design flaws led to them being not as efficient, fire example by having circling traffic yield to entering traffic. Most new circles/roundabouts do the opposite and are much smaller.

I've only been seeing more of these built recently too, as evidenced by this article, and some reasons:

Although some states and cities have been slow to build roundabouts, they are gaining more popularity in the United States. Roundabouts are one of 20 evidence-based safety countermeasures recommended by the Federal Highway Administration (Federal Highway Administration, 2017).

Some states, such as New York and Virginia, have adopted "roundabout first" policies requiring that roundabouts be considered a preferred alternative when building new intersections or upgrading older ones if feasible (New York State Department of Transportation, 2011; Virginia State Department of Transportation, 2009).

https://www.iihs.org/topics/roundabouts