I live in upstate NY, where the DOT is very passionate about installing roundabouts everywhere there is development, as they optimize use of undersized roads, especially in sprawly suburbs. (Search for "Malta, NY" on Google maps and check out the 6 consecutive roundabouts around the I-87 exit)

The problem is they are a cyclist/pedestrian death machine, and the bigger ones cause lots of small accidents. Looking out my office window, I've personally seem a strategically placed streetlight get plowed over about 8 times due to some of the engineering defects of this particular roundabout.

The roundabout in China pictured in the article included an elevated pedestrian walkway -- a feature nearly completely absent in US implementations.