A lot of unrealized potential, which is sad.
First, the good things. The game looks great. A lot of care has been taken in the making of models and environments. The gritty Warhammer world comes out clearly in the visuals. The voice acting is pretty good as well. I like the hero dynamics and the big battles, even though they have a chaotic mob feel to them. The game ships with a number of maps, so you can play skirmishes after finishing the campaign, which is focused on the two new races (orcs and dark elves). I found the game to be very stable on my computer, which is not always the case with PC games nowadays.
Okay, the stuff that I didn't like. Where to begin: Unit animations, while improved over the original game, still do not give you the sense that visceral combat is taking place. Also, there is a lack of gameplay modes in single-player (just the campaign and skirmish). While the campaign is decent, it is quite hard in several missions, even on the normal difficulty level. And you cannot save the game within a mission. Thus, if you fail a mission (and you will), you have to start over. A map editor did not ship with the game, thus modding is not really supported. The game just feels a bit sterile and empty in other ways that are hard to describe.
After having played games such as Battle for Middle Earth 2 and Dawn of War, this game left me frustrated about all of its unrealized potential. The developer has not been known for releasing many patches or providing other support, so I do not imagine that the game will be improved upon in the future.
If you liked the original game (Mark of Chaos), Battle March is more of the same. There is not much here for those, like me, who primarily play single-player beyond the campaign. The game can be played on-line, but I am not sure that there's much of a community. In sum, there are better strategy games out there.