I'm an American applying to UK schools for postgrad, and it seems like the required grades for entry are much higher for US students. A few of the top schools say "upper-second class honours degree or equivalent," then list the equivalent as 3.5-3.7 on the GPA scale.
Now, from having cousins who attended a variety of UK unis, it seems that as long as you put a reasonable amount of effort into your studies, you'll leave with a 2:1 degree. One poster on this site said every English finalist in his year at Oxford got 2:1s. So then 3.5-3.7 is definintely not the equivalent in that case. A 3.3 and above from a good US university, within the US, is considered to be good. In certain subjects--anything where the grading is very subjective--3.7 is very difficult to get. I've had professors in history and politics who do not believe in giving As or A-'s (3.7-4.0) unless you have written something worth publishing in an academic journal.
Now, it's fine for the top UK unis to require a 3.5-3.7, but it is not equivalent to a 2:1 at all. I would say 3.6-4.0 is a first, 3.3-3.5 is 2:1, etc. If they are asking for those GPA marks, it seems that the British applicants ought to have a first degree.
Is this just a UK thing, or do all countries do this preferential standard setting? Are there any British students who find that US unis do the same thing? Do they set standards higher for foreign applicants? Seems like this is just a way to favor students from the home country heavily.