Eh. Bluesky is mid
The AT Protocol is worse than Nostr (almost all protocols are worse than nostr). Both are about the same size in user count. Invite keys don't affect much, but I feel them hosting the main instance themselves was a mistake, as it makes the platform feel centralised and it's impossible to scroll more than about 5 posts on any feed without seeing "Today's Argumentâ„¢". full decentralisation >>>>>> federation
The community is similar to Nostr in some ways and very different in others, people on it are generally more progressive and left-leaning which I heavily appreciate, but isn't engaging beyond that for me because the dev & crypto communities are much smaller. Both are much better than X (very low bar)
Custom feeds aren't such a bad idea and makes discoverability a little easier than just newest-first.