I am also doing a PhD in Norway, but in the humanities (ABD now). I agree with a lot of what is said here: PhD students in Europe, and especially in places like the Netherlands and Scandinavia, have it unbelievably good (not that you'd believe it if you followed the debate here, with "PhD oversupply" and "temporary contract abuse" a prominent topic; to be fair, most graduates from my program have found academic jobs both in Norway and elsewhere, though there is a tendency for people who have spent over ten years in temporary positions to call it quits). However, places like the Netherlands and Scandinavia, even if they punch above their weight in many fields, are not too big in the grand scheme of things. Again, I don't know that the situation is like in the hard sciences or in CS, but certainly in my field the fact that Europe has well-funded PhD programs and jobs does not help the pretty dire (as far as I can see) situation in the US. There are relatively few people who go on to positions in Europe after US grad school, and even fewer the other way around.