What is your opinion about Heroes IV?

What should I improve? Hero leveling? But I'm not playing Diablo.
I deliberately don't take more than two heroes in the fourth game (and preferably one), I like it better, and I think multi-hero gameplay is unnecessary. They could at least set a limit, 2-3 heroes.

I also keep no more than two heroes in one army. You won't get enough experience for all of them. And no one forces you to take more heroes than you need. In general, multi-hero gameplay is a useful thing – you distribute artifacts among the heroes, and each hero of an advanced class in one army will give it its own bonus, etc.