Quest 3 is my first and only VR device so I'm obviously not in the know in these matters, though I have to say I don't see what is so terrible about Quest's flavor of Android either.
For a regular user, most everything seems to work well. Setup was easy, UI is polished and simple enough to get out of your way, and I personally haven't encountered any show-stopping bugs with it. Maybe I don't expect much out of it, as I see it more of an entry-point to actual VR applications I want to use, rather than something I'm more invested in.
If anything, I was surprised how well it worked for a product still so early in its lifecycle.