Depends on gamer's tastes in games. Japanese games definitely seem less buggy, but then again they usually focus on more streamlined gameplay. And some genres like shooters, sports, racing, open world, WRPG they barely even touch. All these kinds of genres involve much bigger scale, stats, and skew to realism. And when any games skew to realism it's easier to nitpick it looks bad or the character or car are moving with odd physics vs. grounded real life comparisons. Japanese games skew to crazy settings and colours where things can float, run at 500 mph or do SF fireballs. So it's easier to accept weirdness as that's part of the setting.
I was agreeing with you ("some genres like shooters, sports, racing, open world they barely touch"), but you lost me at "stramlined gameplay" and "skew to realism", "odd physics" and etc.
There's nothing streamlined about the gameplay of a lot of japanese games that I enjoy, such as those from Platinum, Nintendo (some of them), Capcom and many others. They are usually easy to start playing, but hard to fully dominate the controls. Such is the case with all the japanese fighting games, character action games, brawlers, platformers, even JRPGS and etc. Western games aren't as complex in terms of mechanics usually.
About the "skew to realism" part: in terms of visual design, sure. But japanese companies are awesome in terms of animation. FF XV looks better than any western open world game due to its animations, imo. Nier Automata, Devil May Cry, Resident Evil games ... Even Nintendo games have amazing animations that really sells their vision.
But yeah, I agree that japanese developers arent a reference in many genres. But I think thats the case due to money and local market.
Shooters, sports, racing wouldnt sell in Japan, thats why they dont make them.
Open World games would definately sell, but few japanese companies have the budget to make such games. I risk saying that none of them really have the budget + worforce to make an open world game to go against the western ones.