I've noticed that after Penguin 2.0 the SERP quality for country specific google._ _ extensions are not returning the proper results.
For example if you look up something in, let's say Germany - there are now a lot of results from .ca or .com.au which have no bearing on Germany.
Has something happened with their GEO targeted quality - an algo mishap? I'm not quite sure why it would happen during the Penguin update but it appears that is the exact date it happened. It is very widespread and it seemed so apparent that I figured it would get fixed asap but it's still occurring - if not more so now since the update!