I am giving Quora 3/5 stars because I think that it deserves it. It is just between the best and worst social media/QA websites.
One major issue is that many Quorans go on Quora to have their beliefs reinforced and expressed. They dislike even a mild disagreement. There is no way to check credentials, and so some folks write bad ideas and falsehoods, and people believe in them. There is no way to check facts either. They would delete your comments on their answers, disable their comments on their answers, and even block you for the most petty, silly, frivolous reasons, such as disagreeing with them. They even do so to those who are giving actual factual comments. One Quoran blocks you if you use the word "god" (lowercase g) rather than "God" (uppercase G). There is a whole culture of blocking others for ridiculous reasons. I personally don't do that. I go on Quora partly to learn and improve my world understanding.
For example, I keep on seeing something people write about. But it isn't true. Someone who actually knows this is astonished and appalled by how many Quorans are ignorant about that issue. They are also rude there, as even my friend knows. I've asked one question about this, and of the 25+ answers there, just a few got it right. My friend had to correct them. It is not unusual for a clueless opinion to be presented as a fact. In addition to many falsehoods, many toxic, nasty ideas are mixed in, and people believe in them. Quora seems to be an echo chamber in certain ways. Also, the fiction discussion places on Quora has a certain degree of toxicity.
"Do not correct a fool, for he will hate you. Correct a wise man, and he will love you." -Proverbs 9:8
One thing that really annoys me personally is that if an answerer to my question has blocked me, I still can't comment on their answers TO MY VERY OWN QUESTION. I don't think that it should be this way. This is just pure censorship. I can't correct them or anything.
I have joined Quora in 2015. It has really gone downhill when it comes down to trolls & toxic people, and features. It is still not as bad as Reddit, Twitter/X or the former Q&A website Yahoo! Answers. Many negative changes made there made some of us Quorans think that someone was trying to sabotage it. One thing is by canceling the Real Name policy. This has significantly increased the number of trolls. I do, however agree with canceling the Anonymous feature. It was being abused.
I did, however, learn a lot from Quora and continue to do so.