Screen Wobble is only there if you don't have it open to the point it has locked in place
Screen scratching, I've had some issues with that, but not with scratching, just with it smudging. I believe new units have deeper feet on the screen so it doesn't happen anymore.
The 3DS now has great games, with even more coming over the next two months. It has "taken off". It has also been the best selling console worldwide each week for the last 2 and a half months