Just finished our first run. Was only 3 players (Elf, Human, Undead) but game was great.
The way the balance shifted one way then the other. You could really feel the depth of strategy involved in order choices, and I thought some of the season card game effects (like long winter) were brilliant.
The heroes, while subtle, definitely provided color, though one almost wishes they could have an affect on a battle in a zone they're in (Maybe a HR?).
Battle, while it seems to rely more on luck than strategy, still is fun and full of flavor, and some of the special FX (like the Necromancer's raising new units mid-battle!) are simply awesome.
Anyway, these are just some random ramblings-- Thought I'd share, discuss, etc.--
RB