Profanity: Have any of you played the second Dawn of War and what's your opinion about it then? Oh, and is the expansion a good thing to get too, the chaos rising? I tend to skip expansions and sometimes end up in a very awkward positions of the game sucking without the expansion.
Basically, if you want it for multiplayer, only get Retribution. If you don't want multiplayer, do NOT get Retribution. Original DoW 2 is a fantastic game, something between realtime tactical game and Diablo. There is no basebuilding, you only get 4 units per battle which you have to use as efficiently as possible, and enemies drop gear and your units get XP. Between missions, you distribute stat points, change wargear, and get to more killing.
Quite simply, the campaign is engaging, fun, and sort of repetitive after some time (even thou I think murdering masses of enemies never gets old.) So yeah, that's the original, very worth the price, it has very high replayability value thanks to different builds and tactics you can try, I have myself finished it like 10 times. However, it uses GFWL for multiplayer, even co-op. (oh yeah, and the co-op is really amazing. Just saying.)
Then there is Chaos Rising. It's far more linear (both maps themselves and you usually can't really choose which mission you want to do next as in original DoW II), however it's also far more focused on story, and you get morality system where based on your choices your forces either become corrupted and join chaos, or pure and stay faithful to the Imperium. Story itself is not that great and I consider it slightly weaker than the original DoW II, it's also far shorter. The campaing is still a lot of fun, however, and well worth the money IMO.
Now, if you want to play Multiplayer (but not co-op, 2 former games have better campaigns so co-op is better in them too), getting Retribution is the way to go. It uses Steamworks so MP is far more stable and reliable, most people moved to it and it's got 1 more playable race. While campaign is pretty weak, you get 2 MP modes: Classic multiplayer, where you fight other players, build units, capture points on map etc., and Last Stand, which is a game mode where 3 players fight waves of enemies, level up their characters and increase stats to more effectively fight waves of enemies. Do note that both modes are also availible in original games, they just don't use Steamworks and there's less people playing them.
I must warn you however that I am sort of biased: I love Warhammer universe :D
nagytow: Almost all missions are the same (kill some boss on the other side of the map) with (very) occasional variations in defending something.
Well we ARE talking about warhammer here, of course it's about killing something somewhere :-P Still, while the maps don't really vary, they're pretty big and you will always have to use different path to get to your goal. I find the 'same maps' argument very exaggerated to be honest, maps are open enough to let you find your own path and enemy positions vary enough to give you a reason to do so (you usually fight a completely different army on the same map, and different army means different tactics and approach)
Mohdar: I have Dawn of War 2 + Chaos Rising, and i can say one thing - game was very fun but it's basicaly a hack and slash game, not a RTS like the first one.
Hack and slash? Play it on higher difficulties and you'll need to do a lot of decisions about efficient tactics, and you'll have to scout/plan ahead.