I didn't like the project I was assigned, didn't like the underlying design of the org's charter, didn't like the hours. I also got transferred between managers. I didn't really like it from the director down. It sounded way cooler from the pitch the hiring manager gave me. Team size is not a well-defined concept, TBH -- hierarchies can be structured in very different ways, and a team can be comprised of people with different managers. Also, if you love your director and adjacent teams, it would be unlikely you'd hate your own team.

Once I was inside, I found a few teams that sounded cool. At that point, I could easily meet people on those teams, read survey results on the managers, ask around about the new teams, visit the offices at 6-7 PM and see who was still around. This is somewhere between 10-100x the information I could get as an internal employee than as an external applicant. This led me to joining a team where I'm very happy. And if things went really badly -- I could have switched again! (Might look bad if you switch a ton though)