I hear you on the binding issue! My DMG already had loose pages before I'd even completed my read-through, and with no at-table use at all. Which for a $50 book (for which I paid full price, no less) I find frankly inexcusable.
(Though my other 5e books seem to be holding up better. And the DMG isn't the only recent offender - my Firefly RPG book was also $50, I think, and is also suffering.)
Yeah. They've created a great game here, but there's just one or two weaknesses that annoy disproportionately. I'm almost inclined to call for a 5.1e with no rules changes whatsoever (except the existing errata) but with a better index, better binding, a better character sheet, and some sections rewritten for better clarity/ease-of-use. I'd probably rebuy all three books, even at $50 each, just to get rid of those few "proud nails".