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Like: It's not Reddit.
Dislike: The userbase is too small and there are way too many circlejerks in some communities and you get bashed to hell if you dare to disagree with them.
I'm not sure about the circlejerk thing. I am vehemently anti car and would like to circlejerk on one of the many "fuck cars" communities, but any post that gets some attention gets filled by comments of people not from those communities.
So I very often see posts where I agree with the content but the discussion and the comments are all over the place, from car apologists that are like "but IIIIIIIII live in the woods therefore public transit is not feasible for anyone", and it makes "circlejerking" difficult.
Like, if you have a community about mushroom and want to have enthusiasts discussing mycology, it'll be fine until a thread becomes popular and fills with users not from that community, asking what is mycology and why they should care.
To be honest, I had the same issue on reddit too and that's a major reason why I stopped going there.