Overall I have good feelings about it. It didn't grow as much as I thought it would, and I'm very disappointed in the furry community for staying on reddit, but we're past the hard part of momentum and I expect consistent growth from now on. I find it very odd that the furry community didn't transition to Lemmy, since they're everywhere on Mastodon and furries are always there first for the new/techy/left-leaning things. Whenever reddit does the next user-hostile thing we'll be more prepared.
Lemmy itself is very slick, and I really like how fast navigation is. Video support could be better in the web UI, and multi-communities would be great, but otherwise I can't think of many things that I really need. The comment sorting is especially great, where old comments trend to the bottom even if they're heavily-upvoted. That means that specific comments don't dominate discussion forever, and it keeps a variety of topics active under a post. On reddit you'd almost always see a single comment (probably a stupid pun or something) with 90k upvotes and 700 replies underneath, and nothing else in the thread would get any attention.
Moderation/defederation needs the most work. The big instances have defederated from each other, and Yiffit got defederated from lemmy.ml which is really brutal since there's a lot of big communities there. We need more fine-grained defederation procedures, like defederating from specific communities so that users don't get swept up in the mix. Communities also need to spread out onto more servers - Lemmy.world is making some questionable decisions (new TOS, admin abuse, blocking archive.org links) and there's no power to stop them since they own a good chunk of the Lemmyverse. Thankfully Pawb.social hasn't been targeted by anyone yet, and Pawb/Yiffit aren't defederating from any big servers themselves which stops half the problem.
We also need more posts/topics, and I'm not very good at this part. I don't know where to find OC/new content to x-post to Lemmy, so I only find external content if a friend sends it to me. We have many people with a lot of knowledge ready to comment on posts, but the double-edged sword is that everyone already knows everything and no one needs any help. A big part of reddit's strength was the archive of questions and answers by real humans - we could use more casual/novice users to balance this out.