The sagging wings DOES suck, but it doesnt seem TO bad without the Boosters, so it could be worse. And I can't think of any way they could have prevented it, given the thin wings on the 51.
Looseness will depend on how bad it is and where it is. No one else has really mentioned it yet, so Im not going to panic.
And nothing is perfect; every so often a toy gets put together a bit wrong. it sucks, especially on something this pricey, but one incident does not a horriblew fault make.
It's good to be cautious and get these reports, but let's not start BoBing yet...