All I know is the DS lite and the original O3DS didn't have 'normal' wobbly hinges, and I never broke one on them. And yeah, I did mean forward back movement. So now you're saying it does wobble?
Also, I think of it as an issue, because it really means you can only use the console in one position, looking down at it. You can't really hold it level with your face, or kids can't lie down on the floor with their elbows on the floor, because you'd constantly be aware of the wobble, it's pretty annoying. I picked up a DS lite the other day, and it was heaven compared to my N3DS