Played this game all day while Mercenaries 2, Too Human and Viva Pinata 2 (all addictive games for me) sat waiting their turn. What a nice surprise this game has turned out to be.
This game is basically LOTR: BFME2 + Bladestorm + Fire Emblem (your troops die permanently if you don't watch after them) + Strategy, Strategy, Strategy. I've heard some comparisons to the Total War games (of which I have never played) as well. I've always wanted to play the Total War games, so I guess this is as close as I can get right now.
The controls are a non issue after playing the game for a few hours and learning them. I'm playing one campaign mode (3 different ones) now, and not only is it quite long (6 hours into it and I am halfway done I think), but it is pretty diverse as well. Some missions have you taking on foes with just your heroes, some missions are survival with your army, some are castle sieges, some are just hero duel stages etc... It is doing a good job of gradually introducing new units and upgrades to the game, and even changing up the factions you play as so you don't get too bored.
And the game is challenging, but not cheap. There have not been any missions so far where I have felt I was cheaply beaten. I change my strategy the next time and get a different result.
I read the Mark of Chaos reviews where people had lots to complain about. Battle March is basically Mark of Chaos + an Expansion upgrade. So the 360 version is like getting double the content. Apparently a lot of the criticisms that were valid on Mark of Chaos have been cleaned up in Battle March. I don't have anything major to complain about at all.
Since Mark of Chaos is a 2 year old game, there are some cut scenes where the could definitely have beefed up the graphics on those, but it is all good.
If you want to try a very fun RTS, with a huge variety of cool looking units, with a lot of content, and also something a little different then the normal RTS (no resource farming), give this game a try.