I think it depends on the level of bugginess in the game. Sure, Bethesda should be putting as much effort as possible to fix serious issues. If it is game-breaking, it shouldn't be left alone by the developer. Issues like the bug where the key to the Oculory during the College of Winterhold questline doesn't work on the door are inexcusable (not nearly as much of a problem on PC like how I play, but many have to deal with it on consoles, and it still should not be a widespread issue). Daggerfall, likely the buggiest of any Bethesda game ever, was so riddled with bugs on release that it was literally impossible to complete the Main Quest. Even with Bethesda and community patches it is still really buggy, but playable. Although that was partly because Daggerfall was made on a tight schedule (a little over 2 years after Arena, the progenitor of the series, released).
Personally, I haven't encountered many serious bugs. The Purity quest bug (where you cure Vilkas and Farkas of lycanthropy) was way more of a hassle than it should've been, and quite tedious to circumvent. I seem to remember running into that CoW questline bug that I aforementioned, but it is has been a long time. I must've had to use the 'unlock' console command for the door to the Oculory. But apart from that, not too many big bugs happened to me.
Asking them to fix every bug is a bit much. That isn't to say Bethesda shouldn't do a better job with it though, because they absolutely should.