This game is getting so many negative reviews that I really have to write my first review now... with a more or less good english. Omelette du fromage.

Battlefleet Gothic: Armada is a game where you will command a fleet of more or less half a dozen space ships. You will play battles in space where you will have to fulfill your mission to win the battle - destroy/protect cargo, retrieve data and warp out, assassinate/protect admiral ship, and so on. The game features 4 factions :
- Imperial Navy : humans in slow, sturdy ships. Only faction available for the player in story mod. You like cathedrals ? You like battleships ? Get this Emperor or Retribution class Battleship and wreck all heretics and xenos.
- Chaos : heretics in fast, less sturdy but stealthier ships. Like, sneaky heretics. If you like weird, weird ships and being the bad boy, that's for you.
- Eldar : emo style xenos. They keep on ♥♥♥♥♥♥♥' about their cruel fate and destiny. But they have cool/weird ships too, insanely fast, manouverable and hard hitting weapons. You want to be the "can't touch dis" admiral ? Go on, but beware they're not the easiest faction to start up with.
- Orks : much betta' than dis punny ummies !!! Fun faction that can ram the hell out a cruiser with a stoopid "Brute Ram Ship" -sic. Hard to play with as it can be easily outmanouvered by experienced player.

DLC factions :
- Space Marines : sturdy flying boxes. Quite fast, strafing attacks. Captains got power armour so it's cool.
- Tau : communist xeno scum. Still got some firepower.

In the story mod, you will play a narrative campaign, the 12th Black Crusade, a classic of the Warhammer 40,000 universe. Now I am quite a fan of this universe, and the game is really faithful to it. Sometimes it will feel a bit grindy, as you will play the same missions over and over, with different opponents... but you will do so with new ships, new equipments.
Indeed, in each battle you win xp for your zee cap... uh your captains, and renown that you can sell - yeah don't ask me why - for upgrades, ships, and favours. So beside your tactical decisions on the battlefield, you will have to define the gameplay you want, and pick ships and upgrades accordingly. Wanna pretend you're an ork ? Get some Power Rams on these battlecruiser.

For multiplayer, I'll let you check other reviews because I'm really not so much into it. Of my 33 hours, 32 are in story mod.

TL;DR

+Really cool graphics
+Awesome battles with gigantic ships
+Story driven campaign
-Somehow repetitive missions in solo
?Multiplayer, well there's one

Buy it, burn heretics, kill xenos and praise the Emprah.

EDIT : Wow. Well I wasn't expecting my first real review to be upvoted at all actually. So uh, thanks. I guess I'll go back to MP to try to expand this review further.