For me, it’s the lack of diversity in opinions. IDK about you but I’ve only seen people from here and lemmygrad.ml, and nearly everyone is pretty far left. I’m not having a big problem with it, but the site is very, umm, single-minded.
And this mind is particularly hostile to my ideas
The problem you’re describing is just because there are very few Lemmy instances at the moment, and they all have left political slants. Once Lemmy is more popular in general you will see more general-purpose instances with less of a political focus, instances focusing on a particular subculture or fan community, as well as liberal/conservative political instances.