Those shouldn't really be making it to the shelves, though. I don't think it's WotC's direct responsibility - the printer and the actual retailers should be preventing it, but it does reflect rather poorly on them. I mean, when you look at other books in this price range, with a similar (or even superior) standard of printing, do you see similar errors? I was looking through a bunch of The World of Ice an Fire books at some bookshops this Christmas, and whilst many had covers which had been damaged (I mean, really minor, but I'm picky), all the interiors were identical and fine.
Similarly, of my fairly vast collection of RPG hardbacks and other colour A4 hardbacks from the last twenty-five years, I can honestly say that zero have any of the errors described here (too much glue in various places, smeared text, screwed-up printing, pages falling out within months, spines breaking within months, or 4E's smudgy deal).