From what ive played, they are really fun.
I love reienforcements. This is my fave game mode, i just love it. Im a bit unsure how it decides what units you should get, but its still really fun. Its heavily micro based.
The capture sential is pretty good, but i think its the least fun of the three. I say this mainly because i nearly lost, so ill have to work out some strats. What i found was that i kept capturing the flag with nearly full pop vamps. The enemy was only making hornets, and yet they would run in, and kill my flag carrier and i would have to wait for a flag to come back, and they would hit and run again. Its still fun though, quite and interesting aspect of the game.
The tug of war mode is fun aswell. Its a good game mode for all you turtlers. You can win without attacking....kinda, you must pull the bar all the way to you. If you have a nice ol turtle, and they attack you and lose everything, then you win because your meter fills up. for the more experienced player, alot of hit and runs are key to winning. Sacrafice weaker units in order to take out a high point tarket. I suggest infantry is a good part. I won a game by doing a huge attack, killing alot of things, and then spammed grunts to fill my meter and then hit their SP's. Won me the game, and it was satisfying.
For those of you who are halo wars fans, then its good DLC to get. Im happy with my purchase, and i can see myself enjoying it.
EDIT: I would of liked to see this free, but realisticly, it was NEVER going to be free, and we all knew it. As far as DLC goes, its a bit on the pricey side, especially for us english, but its still hardly anything. Ive spent more on lunch sometimes, so a days lunch for 3 gamemodes that will give me a good few hours on entertainment is a worthwhile purchase IMO.
1v1 - 48
2v2 - 50
3v3 - 47
Best player evar!!!1!