The game is great but would be much more difficult without the Guides players have posted. I'm on my 3rd time starting the Campaign and I finally feel like I have a hang of things.
As was recommended by one Guide, I save often, before and during a battle. If I really screwed up I hit restart and try again. Which helps to learn what kind of tactics work best. I hate to not get a victory and not get the phat loot to build my army.