Awesome, awesome game; I cannot recommend it highly enough. For those who aren't yet familiar with the game it's basically an RPG/TBS hybrid- best comparison I can make is an adventure/rpg style HOMM map, but with realtime overworld movement. The diversity of unit types (and their various abilities), spells, and spirits of rage offer numerous different strategies, although some overall strategic vision is required to make sure one's army, spells, and skills all compliment each other well.
I also have to disagree with some of the criticisms offered up. With regards to Zingrad, I'll say that quest rewards tend to be proportionate to the difficulty or length of quests. Easy quests do only provide marginal amounts of gold and experience, although tougher and more involved quests often are rewarded with useful equipment, talent runes, scrolls, or new creatures being available for recruitment. All in all I think quests and rewards are balanced out pretty well. With regards to Wishbone, I personally think the limited number of certain creatures is a good feature, rather than a flaw, as it encourages one to limit losses, instead of simply fighting battles of attrition, but this is ultimately a matter of personal opinion. However, regarding determining enemy stack strength, there's a scouting skill that will allow you to see increasing details about an enemy stack, including an estimate of their strength compared to your own strength. A few battles with different creatures should also give a pretty good idea about what kinds of enemies your army can take on easily or will have a harder time against (for example, an army with both Priests and Inquisitors will absolutely decimate an enemy stack with mostly Ghosts, while an army with mostly melee units will have a much more difficult time).
Finally, I'll just say again that I highly, highly recommend this game, and if you think you might enjoy this type of game at least try out the
demo.