I've had much more trouble with American paperbacks falling apart despite being quite new, and with the ink problem you mention. Also, whilst some of the American covers paperback SF novels get are lovely (and some British ones are quite, quite vile), the vast majority of them strike me as quite overcrowded and ugly compared to the British versions. I don't think I've ever had a problem with misaligned text though.

I think if it was my book I'd get a bit worried after a couple of months - ten days is nothing.