Yo, since the standalone Retribution expansion came out and it's currently only $15 on Steam, I finally got drawn into this game (almost entirely for The Last Stand), so if you guys play this, hit me up! My Steam name is the same as my name here (lolisauce).
Also if you haven't gotten it, the Wargear Bundle DLC is worth the $12 for the bonus items it grants in Last Stand and Campaigns.
If you haven't ever played Dawn of War 2, I'll break it down for you. It's essentially a squad based RTS game at its core with the ability to utilize environment as cover. The Campaign mode can be played single player or co-op, which is awesome, and ends up playing more like an RPG with leveling up your commanders, unlocking skills via putting points into their skill trees, equipping items you get as mission rewards/stage secrets/random drops. There are two modes of multiplayer, one being standard RTS with 1v1/2v2/3v3 matches, and the other being a 3 player cooperative survival mode called The Last Stand. Last Stand is more similar to something like DotA/League of Legends/etc type of play, where you each control one commander with various equipment that each grant you skills and passive traits. Leveling up over multiple plays with each character (there are 6 total) earns you more equipment to play around with, diversifying your character and opening up more creativity in the builds you play. It's really fun.
Also feel free to geek out over Warhammer 40k general discussion in here if you want. I know a bit and have been learning a lot more since I started playing DoW2, so I'm starting to really get into the lore.