Warhammer 40K Soulstorm brings the same addictive gameplay to the genre. That being said, same is the keyword.
Dark Crusades introduced a new single player campaign mode as well as new and unique factions. The Tau and Necrons races had a refreshing way of dealing with resources and conquest. A new race like the Genestealers would have probably been a good introduction into the series. If not just for their unique appearance it would have given the Warhammer 40K legacy a refreshing twist.
Once again the game is by no means bad, its just a little lacking, especially with a $40 dollar price tag stuck to it. These races and unit expansions could have easliy been accomplished with a couple of downloads for the fans. I would say that its worth the buy if you want to keep up with the ever expanding Warhammer universe but should have only had a $20 dollar price tag on it.