Early access in general has led to a major decline in the quality of games upon release sadly...I remember back when games came out and patching them on console was impossible and very difficult on PC regardless...I seem to recall games being much more stable and bug free in lots of cases...or at least not the same monsterous disasters they are these days when they launch...
I agree with your general point about the decline in quality upon release (although I think we've not seen a great many of those poor-quality games truly 'released', since they tend to enter perpetual beta or simply get abandoned, from most of the ones I've seen). However, I'd be wary of perhaps viewing the past through rose-tinted glasses - there were definitely games in the past that have been released in an absolutely shocking state, with some truly mindnumbing bugs and glitches. The one that springs to mind is Myth II, which (if I'm remembering correctly) shipped with the potential to delete your hard drive's contents if you installed it into a non-standard location and then attempted to uninstall it. Fortunately Bungie caught it before it hit the shelves, but only by virtue of actually going to the outlet locations and retrieving the stacks of shipped games themselves (and then issuing a new, fixed edition later on). It wasn't exactly a polished release programme.
Games being released with bugs and without good quality control is not new. Games being visible prior to release, and then stagnating there, with commensurately more of those bugs/content problems, is new. Which I think is basically what you were saying anyway, so this entire post may be somewhat redundant.
Edit: oh, wait, and the Terror From The Deep research bug - if you research things in the wrong order (with no clues as to what the 'right' order is), you dead-end and basically lock yourself out of the endgame. But without any indications as to having done so. Welcome to never-ending watery doom!