The US has plenty of defects too. Not sure what really stands out as a good one to me that exists in the real world. Australia seems to have some good bits...but maybe that's just because I'm not familiar with it.

Parliamentary systems with proportional representation, but the research does show they are better over all --- both theoretical and empirical. The situation in Italy is unfortunate, but I don't think it is a good reason for the US to rest on its laurels.