The Dawn of War series is decent. The campaigns and dialogue are solid. RTS gameplay isn't exactly my cup of tea, but the single player campaigns are fun enough.
Mechanicus is great. Incredible music and dialogue. Fun tactical combat. Story is kinda meh.
The Rogue Trader CRPG from Owlcat is pretty fun. Good story, roleplaying, and character building options. The tactics are fun but not quite as tight as Mechanicus.
Second this, if you like X-Com style combat this will really hit the spot. Abilities stack and are comboable in really fun ways. The only complaint is that there is a lot of text in this game, which can be tough if you're playing with friends, and six characters can be a lot to level up and equip.
I haven’t played it in a couple months, but I remember the quality and polish taking a serious nose dive as you got deeper into the game. Is that still the case?
It definitely got better, but can still be buggy. You can also pretty much guarantee there will be some bigass bugs when the new DLC comes out, it's the Owlcat way.
I'd say the actual quality doesn't take a nosedive anymore, the game is pretty consistently fun from start to finish. The beginning definitely has more going on though.
I really liked Inquisitor Martyr. It's sort of Diablo-esque. It certainly isn't amazing, but I liked the art and story and some of the gameplay. I think you can couch co-op it too.
For RTS, the original Dawn of War is excellent. Especially for the time it came out.
Chaosbane is okay but got old.
I played the first Blood Bowl like crazy on PSP.
And then Space Marine is an excellent story with great kill animations. It can be very difficult as well if you want, if you're into that.
I still play it, even though the console version was basically abandoned ages ago and we didn't even get the offline mode and seasonal journey PC players got. It's still really fun regardless and is recommend it to anyone who likes that style of game.
Vermintide is a lot of fun. The total war Warhammer games are pretty good.
My personal favorite (as an RPG fan) is Rogue Trader (40k) by Owlcat Games. Game is superbly written and the combat and world is pretty fun too. If you hate CRPGs, stay away though. This game really showed me the secret sauce Warhammer 40k has going for it.
I'm excited as hell for space marine 2. We'll see how that goes.
I really like Space Marine. It was my introduction to the series and I even dabbled in the multiplayer which I normally never do. I tried future war hammer games and they just never clicked for me.
I liked Space Hulk: Deathwing. Not sure what the general Warhammer 40k perception is on the game, but its a pretty fun coop shooter that has exactly what I was looking for. Plus its usually on sale on Steam.
Now, I am not a Warhammer superfan. I don't know any lore except that pretty much everyone commits literal warcrimes on an hourly basis and everything is incredibly aggressive. I know some stuff like the Ultra Marines and a little about humans in the time, but I would say I am so on the outside of the fandom I must look like a casual to a casual Warhammer enjoyer. Maybes that's why I liked it, who knows?
There are many good games in the 40k universe. There are a few bad ones, and there are a couple great ones. If you pick a genre you like there is probably a 40k game that is a 7-8/10 in that genre.
I just finished dawn of war soulstorm but with Chaos. Planning to play again with sister of battles. I bought it on steam sale a few week ago. I lost count on how many times i play the game. The only dawn of war game i have ever play.