This subject rises with superb coincidence.
I am a tester right now for an Advanced A.I mod that will soon appear for the public, for Soulstorm. The famous Dawn of Skirmish A.I, currently available for all of the WH40K games except of course SS, because it's so new. However the A.I code porting/merging was done months ago thanks to the team's internal contacts with Relic and that time around Iron Lore (before it closed of course, sadly). Right now the vanilla A.I is very limited, too few efforts and not enough time was put into it by Iron Lore. What they've done was to take much of the already existing vanilla code from WA and DC, and they adapted it to the new races, but not much else was done. I'm not an A.I coder myself, sadly, I'm trying to explain this as best as I can. But as a tester I'll do my best to help accelerate (without compromising its stability and quality) its release to the public. The team's actual coders will receive the first build either today, in a few hours or tomorrow, and then it should be approved for the testers soon after.
I'm posting this here because I thought that I should point at the fact that, indeed, and it is confirmed, the vanilla A.I in SS is quite poor. As an example, go in skirmish and see how long it'll take for your ally/enemy to build a vehicle (there's a major bug right now in the build priorities and orders, preventing vehicles to be built for about 90% of the time). If you guys want a good, challenging, competitive-quality A.I in off-line (or on-line, too) skirmishes then you'll have to wait for that must-have modification. At the moment of its release Soulstorm will suddenly shine. And keep in mind guys that it was the exact same story with Dark Crusade and even Winter Assault when they were first released (even though, technically speaking, Relic did worked more on their A.I for the vanilla version than Iron Lore did for SS, probably due to better resources and/or time to do so, I personally do not doubt of Iron Lore's A.I coders' talents, but when you have a deadline or you have a lack of help because there's only two or three guys working on it then you can't do miracles).
With all that said, Soulstorm by itself, A.I excluded, is a very good game, and is right in line and very comparable to DC's quality, and don't forget guys, for those who've played it, that Dark Crusade had major imbalance issues at release (Tau Krootox anyone?). It's always a question of time and patches before it gets better. I do have some complaints, as always (no games are perfect, that shouldn't be new to anyone), but in my book Soulstorm is a better product than DC or WA was, to me it's the best expansion so far, simply because adding those two new races just completed the cycle very well for this series, and if Relic ever intends to plunge into the WH40K universe again then they'll have to seriously surpass themselves since all of this huge game-play base, and all its basics are now established very firmly. Their series is now a reference for any other attempts at doing another Warhammer 40,000 game into the Real-Time-Strategy genre. It was worth buying, and it should be a good way to remember its now defunct development team.