Roundabouts are almost always a good idea, assuming there is sufficient traffic. They keep traffic flowing faster, more predictably, and with fewer accidents.
https://www.iihs.org/research-areas/roundabouts#traffic-flow...
Btw your 'classic pattern' of highly unbalanced traffic flows is specifically called out as a non-ideal candidate for a roundabout, maybe the urban planners get cow milk in their lattes after all.