I see like three trends that all seem to be dead, so I have no idea what people in the world are actually talking about. All I see is that about 500 people talked about the FIFA World Cup final game during the past 48 hours, since that's taking two out of three top trends.
"Tweets" are much longer, so it no longer feels like microblogging. Sensitive content feels even dumber, I don't want to click "Read more" in order to view a tweet like it was some kind of a ad-bait blog post.
If someone sends me their profile link that's not on my instance, I can't actually reply to it. Instead, I need to go to my Mastodon instance and then search for that link in order to actually have an interactable version of that "tweet".
Everything also feels slower, possibly because it's having to juggle between so many different instances.
And I have no idea if I chose the right Mastodon instance with the right hall admins that won't read my private messages and ban me for having the wrong opinion.
I'd much, much rather stay on Twitter. It's just that no one has any idea if it's going to be a viable platform in the future and who are going to stick around there.