You are free to say whatever you want and the staff will respect your freedom of speech as long (!) as the tone of the message is respectful. Hate speeches are discouraged. If you want to trash-talk someone or something, you’re honestly better off not saying anything at all.
Constructive criticism on anime is of course always welcome and if your comment looks like it is not just some hate speech but an actually well-written article then there won’t be any problems with the moderators.
Respect the makers and respect the person you are talking to.