*Company treats people as disposable. They burn some people out and put up with too much bullying and unwarranted finger-pointing that pushes others out. If you look through all these reviews, you'll see a cycle in which there are a number of reviews discussing this tendency, and then a new batch talking about the "great culture." They basically just shrug when people get screwed over, and then hire a new batch and get them to write reviews while they are still starry-eyed. I think they consider the excitement to be the "culture," but if you're shoving people out instead of dealing with the factors that make them unhappy, *that's* your actual culture. And they have developed a reputation within the industry for treating people badly.
* "Grenade-throwers," as someone else aptly put it, are given power and influence, without having to prove they actually have any better plans for improving the situation.
*Lack of clear paths for advancement. It seems like there would be opportunities, because the company is growing, but they don't develop people to lead.