Now, ill start with the bad points. The game is very like the Dark Crusade version, to be honest there isnt much change in units at all, bar the flying units been added for each team. Thats it. The game is brilliant, the introduction of the new Sisters of Battle and Dark Eldar have turned the game into a masterpiece. Although many people think the Dark Crusade game is better, I disagree and think that you should really test ride this game before turning it down. The game is alot more stable than the Dark Crusade game, and its not even easier to fight well in games. The game is more leveled out, so that low level units just dont pwn everything, and high level units still have weak points.
A mention of the campaign, it has a new layout to the Dark Crusade campaign. It is alittle confusing, but instead of the one planet on Dark Crusade, there is now 4 on Soulstorm. Due to this, there is now 32 (i think) new maps for the Soulstorm game, which makes replay time high.
Overall, I have been playing this game 3 days now and I think its utter brilliance.
Would give more stars if possible, and would definetly reccomend.