Different units and magic items add surprise, but the small number of units leaves you with very few choices. It wasn't bad mind you, but the plot and story that drove the campaign are missing here, and that makes it less appealing. Graphics, Sound, etc. The battlefields are all neatly rendered in 3D. There are a host of different terrain types, and all look pretty good. Animations are generally good, although small.
Units march and fight in formation, dieing in explosions and while running on fire.
Some of the magic effects are also quite nifty. Overall the game looks good, especially fully zoomed out. Zoom in to see the detail and, well, this isn't StarCraft . Sound effects are good. Weapons firing all make unique sounds, units sound the retreat and the charge, Orc, Undead and Human units all have distinct death and victory sounds.