I prefer the first Dawn of War game and its expansions. My only major complaint with it is that the Space Marines aren't as powerful as they're depicted in other sources. Fortunately there are some excellent mods that address this. Also, I play offline Skirmish the most when it comes to RTS games, and DoW 1 delivers in spades, with an extremely varied selection of different races with their own strengths and weaknesses (I'm an Imperial Guard fan myself). Finally, there are several mods out there that add new factions, which extends its replay factor even more.
Don't get me wrong, Dawn of War II is still a fun game. The Space Marines are as powerful as they should be in the campaign, and Last Stand mode is quite enjoyable if you've got good teammates. However, I found Skirmish lacking in DoW II. It's nearly impossible to completely destroy the enemy since Relic gave the bases ridiculous amounts of hit points, and I find control point victories boring. I mean c'mon, this is Warhammer 40k we're talking about. With the possible exception of the Tau, every faction's goal is to completely annihilate all other forces.
Don't get me wrong, Dawn of War II is still a fun game. The Space Marines are as powerful as they should be in the campaign, and Last Stand mode is quite enjoyable if you've got good teammates. However, I found Skirmish lacking in DoW II. It's nearly impossible to completely destroy the enemy since Relic gave the bases ridiculous amounts of hit points, and I find control point victories boring. I mean c'mon, this is Warhammer 40k we're talking about. With the possible exception of the Tau, every faction's goal is to completely annihilate all other forces.