Reddit is strictly subdivided into subtopics in a way that most other platforms are not. Consequently, the type of content varies widely among subreddits. We can't really talk usefully about what "Reddit" is like. We need to talk about what r/foo and r/bar are like.

I moderate my own subreddit, and it's definitely not "angry indignant rage inducing crap". That's the other thing: Reddit is moderated in a way that most other giant platforms are not. Of course the standards of moderation also vary widely among subreddits.