Yeah but they fixed that with dawn of war 2. Plague marines, Plague champion(hero unit) and the super unit GUO. Tzeentch and khorne have about equal stuff in terms of upgrades/strength. Slaanesh? All you get is noise marines, they are not even that good as I said before. I mean look at about 1:59 of the video in chaos rising heretics had extra lines most likely they could get marks they even had slaanesh lines too, yet it was not added. Well thats enough whining out of me I made my point. View: http://www.youtube.com/watch?v=_IvWQ9d27OU
Forgive me if I'm mistaken, not all that up to date regarding Thousand Sons, but weren't they shattered?
Most Legions have been shattered. The Thousand Sons are in two camps now: those with Ahriman and those who aren't. They both still claim their Legion identity though.
Not really, they were razed at prospero, but they still had a thousand. A few less minus Ahriman and his merry bunch. Then they were left with 700ish when the whole Fang thing happened, but in the Thousand sons lore, there is in fact a resurrection ritual that brings back the dead that binds the soul of the lost brother forcibly to a host, which gradually transforms them into a Thousand son. "On this occasion the spirits of deceased Thousand Sons were summoned from the warp into mortal bodies (whether living or dead making no particular difference), bodies which then transformed themselves into reborn Thousand Sons" From Lexicanum