Firstly I have played Dawn of War II and Chaos Riding
BTW I have not played Multiplayer yet?
Gameplay - not as good as DoW II / Chaos Rising
Sound Effect are good
You also need a powerful computer to get the best out of this game.
My Specs
I7 3.40Ghz Quad Core
8GB Ram
1GB Radeon 6500 HD edition.
It runs fine on this spec, but will most likely struggle on the highest setting of anything under Dual Core
Graphics - 9
Gameplay - 6
Sound - 8
Playerability - 4 (once you have played all Scenarios)
On a final note. If you like DoW II / Chaos Rising you MAY be disappointed with DoW II - Retribution