I also think so. You can usually tell who is close to your own level, but anything too far off andthe signals for what is considered smart or dumb tend to blend together.
The one trait which usually don’t lie is the person ability to learn. Fast learners and autodidacts are almost always smart, and people who are slow to learn are almost always left of the curve. Other signals you mentioned are deeply rooted in culture and can reqlly give the wrong impression.
It is crazy how Steam users seem to interact with the platform exclusively in bad faith. The reviews are filled with memes, joke reviews and drama. You will lose IQ points just by opening the forums. And of course, people troll the awards. Not that I would expect a mainstream gaming platform to attract geniuses, but Steam community is definitely bottom of the barrel.