I've been a 40k fan for about a year and a half, but I have OCD where I obsesse over things, so I know as much as a old-time fan (Life? I think not). Anyway everything I play in Video games thats have some simularity to 40k (which is pretty much anything with violence). My friend and I even did an Rp in Left 4 Dead, Bill as a Vet. Cadian and Francis was a Catachan, Zoey and Louis were just civilians and we had crashed on a 'primitive' planet with only SP weapons (Hunting Rifle, Autopistols, Stub-Automatics, Autoguns, Autocannons, Fire bombs, ect) and the planet was infested by a Nurgle invasion that the PDF couldn't handle.

In Killzone2 we we're PDF (ISA) fighting off a traitor guard invasion (Hellghast).

Pokemon Diamond and Pearl - we're vermin speakers (lol jk)

In Gears of War 1/2 - we were Tech-Guard ( the gear and skull?) Skitarii

Halo - Imperial Guard/ xenos (we're not big Space Marine Fans)

Predator: Concrete Jungle - Eldar Ranger, or a xeno hunting in a hive city (this game actually has dreadnaughts)

Elder Scrolls: Oblivion - Imperial Guard on a Fuedal World (they actually say "FOR THE EMPRAH")

So what games do you put with 40k