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Mostly on mobile but I do remember playing some browser games with Made With Unity stigma on them.
It's like a sign to stop where you are and start playing something else! 😅 Like a guarantee, of the worst gaming experience one is about to have.

I was just wondering, what is this crap? a language? engine?

Unity is a game engine.
Unity is not the issue it is how the game is coded or the back-end architecture.
There are a ton of really bad devs.
I was asking for webgl games like we have built there is a delay in the broswer loading the game, not much you can do about this at the moment but new tech is coming out.

Also most games that say Unity are non-pro users.
a lot of games you play are Unity but are pro users so they can eliminate the screen and understand how to code better.

If it is mobile a ton of mobile games are made in China and India and the devs are not good.

Its not a Unity issue its a dev / design issue.

Gotcha! Thanks for a very comprehensive answer. 🙏 Perhaps from now on I'll give games made with Unity another chance instead of just removing them.

Sounds good.