It's nice, but it's not perfect. My gaming pc currently uses big picture but I still have recurrent issues at times. Like the inability to fully disable the guide button for certain "games" when that would be a super useful extra button for emulators like retroarch.
Couch gaming is just not that great on PC sadly. I'll deal with it because it's the only way I get close to exactly what I want, especially with the emulators. But it sure as hell doesn't replace an actual console experience that I find myself using way more than my PC that I have probably spent more on over the years than my PS5 cost, which is also more powerful since my pc setup is pretty old (still on a 1050Ti).