Gameplay, unit diversity, character creation, setting up formation and other aspects of this game makes it very enjoyable. Farming areas besides act 1 level 1 or 2 is pointless. Wizards are useless.
For those of you struggling, you can make this game a lot more difficult then it is by using a variety of different units. I managed to beat all 3 acts by using only 2x steam giants at the front and archers equipped with warbows/rhigar's bows. its all about using common sense to beat the level. If they level starts with suicide bombers, pull your steam giants back a row or two and let the archers kill them before they do any damage. If you obtain a rhigar's bow, then make sure the archer with the bow is behind the warbow archers. iF the enemy has a lot of ranged units then set all your units to fast.
2x steam giant+archers+common sense = beat the game.