Yes, the unit composition in 7 Heroes is better than in 5, but what's the point? Everyone uses 7 units, they all have 100 melee attack and magic immunity, and that's it. But this is a completely different game, it's called Age of Empires, I think.
There was one "expert" here who also knew everything about the game and was ready to beat everyone online. He said that if you play as Necropolis, you shouldn't buy Haven units. Because if you play as Necropolis, you should play as Necropolis.
Players, man. :D