I have loved DoW since the original and think that it's well worth looking into for any RTS fan.
Just a couple of things the review doesn't go into enough:
1. As well as being an expansion, this is also a standalone game. You don't need the original game (or Winter Assault expansion) to play the single player. All races are available to play the campaign.
However, without them you can only play online as the two new races.
2. Unlike most other RTS games, you cannot win a game by just building up your forces inside your base. Trying to "turtle" (as it's called) will get you wiped out by someone real fast. That's the joy of DoW - you must constantly push forward if you want to have any chance of winning.
Not so much an issue against the low level AI, but harder AI and online you will get crushed.
And since the original game and Winter Assault can now be picked up really cheap as a bundle from most game stores, it's well worth picking up.
Oh yes, and everyone knows Gamespy is evil