Different priorities and levels of tolerance, perhaps?
Visual glitches, bugs that don't stop me from playing, bad UIs and inventories just do not factor that much to my enjoyment i.e and I do not often find it worthy to dwell too much on them, if the game has in abundance all those very important traits you mentioned…
That is why Developers like Troika feature among my all time favorites and even the train wreck (on release) Gothic 3 is a game that I have replayed upwards of 3 times when it came in a playable state(*)…
That is not to say that its Ok to be fanboy blind to those flaws (I was quite vocal and pissed with PB on that release)… Waving them around as a flag and contradicting polish as a mark of quality and excellence is equally off imo…
For most people, I believe (myself included), its not about giving a favorite underdog a pass (you will not hear me bellyaching about technical problems in Bethesda's games either) but having a particular problem with the amount of double standards and downright misrepresentation that comes from the "professionals" of gaming journalism, when reviewing a High profile Dev/Publisher game vs the aforementioned underdog…
(*The most serious and immersion breaking/fun ruining ones should be fixed eventually of course, and it kinda sucks if the developer does not do it themselves and in a reasonable amount of time…)