Ones that are well implemented can be quite reasonable, but there's also some pretty crap ones as well that refactor themselves down until they're pretty much as bad as some of the worse "mobile sites" out there. Of course, in the past when a site tried to force you onto a particularly nasty "mobile" page, you could just toggle a browser option to be fed the normal desktop page, but with these responsive ones, that no longer works.
From the reading I've been doing (I'm not a web developer!), I see this is related to the viewport that the device reports. In the event of my phone, it reports a viewport width of just 320 pixels. What I'd like to know is, is there a way of spoofing this and reporting a larger viewport value to certain sites to get them to supply the standard desktop page? And if so, is there then a way of being able to zoom into such a site without the page automatically re-ordering itself?
Searching for info on this seems to result in 99% of hits telling me (as a developer) how to enable it on my site - not how to override it as an end user! Of course, a PM for Android way of getting around it would of course be best

