It's an inherent problem with the way the Reddit algorithm works, and considering Lemmy's algorithm is somewhat similar, it's probably an inherent problem here too.

You usually have to read a comment before upvoting it. If it's a short pithy joke, that takes just a second. If it's a lengthy, more thoughtful comment, that might take as much as a minute to read. One person can easily upvote 10 pithy comments in the time another person upvotes 1 deep insightful one. So lower quality content will tend to drift towards the top.

While we can't expect meme communities to do any better since that's what memes are supposed to be, I hope news and tech communities are better in this regard.