Some of what Marvin P. Wrote in his review is true.
- Quora is not a serious Q&A site (sometimes it is).
- Quora does not support free speech.
- Non-liberal views are deemed offensive
- Sensitivity is more valued than the truth
I am not sure about some of his other statements. Many of my answers are firm in tone with strong language and controversial (at least for liberals), but although many were collapsed (probably by other liberals on Quora), I was not immediately punished by the administrators. I would not characterize the administrators as being especially suppressing of dissenting views. They are undoubtedably liberal, but I don't believe that they are as bad as Martin P. Describes. I will admit that I have not studied the answers of the admins nor had discussions with them, so I may not have the same knowledge that he does.
As far as the feminism that Martin P. Describes, I don't believe that it is as bad as he makes it out to be. Feminism is undoubtedably very well represented on Quora, but its proponents are not (at least according to what they say) man-hating.
That said, Quora is not a place to go to for truth. The "Be Nice, Be Respectful" rule is enforced with a view towards niceness and not respect. If you criticize certain groups badly enough, then you will be banned. Even if your interactions in replying to individual persons are respectful, your answers need to be both respectful and nice. In other words, your answers can't say anything that could hurt someone's feelings or, more especially, contradict their liberal beliefs.
If you are not a liberal and are interested in a thoughtful, scholarly discussion with others, then you will not like Quora.
If you are interested in the truth about anything that matters (such as the big questions), then you will not like Quora.
If you have dissenting non-liberal beliefs and are not afraid to share them, then you will eventually be banned (but before that, most of your non-liberal answers will be collapsed and you will get a lot of abuse from liberals).
If you believe that women are not the same as men and expect to obtain good information about differences between them from Quorans, you will be disappointed (so don't even ask). If you are so bold to suggest that the sexes (always genders on Quora) are different, you may get harassed and flamed.
From personal experience (and based on guesswork derived from the silent and punitive administrators) the "protected" classes (at least as far as the current administrators are concerned), which cannot be seriously criticized on Quora, in order of decreasing importance are:
And you will probably not receive any explicit warnings before you are banned.