I actually like Heroes 6.
Yesterday, I played the "Broken Alliance" scenario on "hard" difficulty against 5 "strong" AIs. I tried playing as Jaywood, a Warrior hero from Necropolis. The conclusion is that playing as a Warrior is boring and unpromising. IMHO
Let me explain. 1) The Warrior doesn't have ghosts at the start, so you have to take the Hall of Heroes and 2 heroes, which wastes a lot of time and creates a development lag. 2) The Warrior's abilities at level 15 and above are insignificant compared to the Mage's abilities at the same levels. 3) I played for 5-6 hours and could only hold 3 cities, and I rarely managed to keep the 3rd city. 4) The opponents were higher level and stronger. 5) This is despite the fact that the Warrior was very strong as a warrior and had a LOT of powerful artifacts (for example, an artifact that makes the first three attacks of the enemy deal zero damage, i.e., are unsuccessful). 6) I couldn't finish the game because I didn't have time for replays. Although, perhaps, it should be interesting because it's difficult. ;)
I got angry and loaded the same scenario, but with Zendai, a Mage from Necropolis, and, lo and behold:) After only 1 hour, Zendai controlled 4 cities, and the opponent was hiding somewhere in fear. I didn't have time to finish the game. Maybe I'll finish it tomorrow.
Conclusions: 1. I came to the conclusion again that the "Reinforcements" skill is not effective (at the beginning, and it's not needed at the end either). 2. The best spells are "Agony (area)" and "Drain Life (area)" because of their mass effect, simplicity, and high efficiency. And the very best SPELL of ALL SPELLS is "Agony (area)", yes, despite its seemingly insignificant nature. The cool spells are, of course, "Time Stop" and "Summon Earth Elementals", as well as "Explosion", "Lightning", and "Ice Block". IMHO
But this strategy certainly won't work against a human player. And it's only possible to build Champions by the 2nd week on hard difficulty on resource-rich maps.