Which Hero from Heroes of Might and Magic III is the best?

Why isn't anyone voting for Adrian? Doesn't anyone like having an Expert Inferno spell or just an Expert Fire Magic spell at level 1? I think such a hero would be useful even in regular random maps... perfect for rushing!

Not really "perfect." In the early game, up to level 5-7, yes. And even then, it's not great. Later on, Fire Magic won't be very useful in swamps. Considering that Adrian's specialization implies "Expert Fire Magic" from the start and doesn't give any other bonuses, it's more beneficial for long-term play to take any other sorceress and level up her Fire Magic if it's really needed, although it's better to focus on Earth and Air or Water. :)

And regarding rushing... After a couple of Inferno spells, the hero runs out of mana, and instead of rushing, they start searching for mana wells. :)