It's complicated. Startups are always dysfunctional, and it gets magnified by people who aren't used to it. What they say on these sites it almost certainly true, but it's relative, not absolute, so it's hard to get a sense of how outside of norms it is.

Like if someone says none of the execs know what they're doing, it's going to fall apart any day, are they a new grad, someone who's only worked at big companies with everything formalized and an established business, or are they startup veterans. You don't really get that context.

So the best you can do is try to judge it based on your experience. If you find those comments concerning, maybe it's not a good place for you. If you think "yeah everyone says that" then maybe it's ok.