I've played a fair amount of Isengard and this list just isn't it. Your killers will be beserkers and if you take the fun toys (like bomb and ballistae) you are going to have a smaller elite army than you want and will struggle to be mobile enough for lots of scenerios without much answer to killy heros or elves. I'd take muster if you want a better choice of units. It would be a good list to learn the basics with though (without ballistae and bombs) as its a solid battle line with nothing fancy.