Somebody I know has one and the hinge felt loose from the moment it was opened. The screen wobbles back and forth like a worn out old Macbook Pro. I haven't seen this mentioned in any reviews -- can anybody comment?
It certainly isn't - the hinge on mine is significantly more sticky than my previous MacBook Pro Retina, which was in turn much more solid than my MacBook Air (at it's best), and when that hinge got wobbly they replaced it.
I have two colleagues that both got 13" MBPE (MBP Escape button version) and none of the screens are wobbly by any means. They are perfectly weighted like the previous versions if not better. 15" may be slightly different due to size, but it shouldn't wobble.