What’s wrong with the romance between Han and Leia? Their back and forth banter is one of the oft-cited strengths of the film, and I agree. Their chemistry on screen is really fun and engaging.
It’s basically the “boy sexually harasses girl until she gives in” storyline. It’s very well done for one of those, but that’s the core. There’s also moments that undercut that angle and add a little more depth and real connection, giving Leia a little more agency in the relationship, I’m not denying that either, and the onscreen chemistry is undeniable. But it’s definitely a problematic part of Empire IMO.
That said, Empire is my favorite film of the trilogy by far. But if I’m giving advice to my sons about how to approach romantic relationships, “Don’t be like Han Solo” is right up there.