Biggest problems I have had with Mastodon are the fact that:
The app I wanted to use didn't even recognize the instance I signed up for and...
I had to wait nearly a month and a half before being able to actuallyuse my account and access Mastodon because I joined an instance where they review people signing up or something similar.
I definitely see the appeal of a find the site, sign up, and you're done services over the fediverse join an instance and pray service.