Warhammer 40K: Darktide

Purge the heretics!

This horde shooter is very much in the same vein as the less futuristic Vermintide and Left 4 Dead with scores of Nurgle worshipers and their special units to dispatch (like one that pounces and then you need help from some one else to get up and another that you need to quietly avoid) while doing random tasks like bringing fuel cans power cells to designated spots, scanning for demon residue (shouldn't that just be everywhere) or hacking with very faulty equipment.  

The major difference with this one is almost 50% of your opponents now come with guns, and those really do hurt! Either you'll need to out snipe them as a veteran, block the damage as a mighty ogryn, cleverly draw them close (or just charge like a maniac) as a zealot, or pop their heads with your mind powers as a psyker - at the risk of popping your own head too - void powers are fun that way. Those are the current four classes available and you do missions in squads of four.

The most annoying parts though are the market, which sells you a random assortment of weapons every hour just to make sure the odds of you finding the one you want are low - and this is worsened by the ridiculous login time which Archer rightly quipped "takes three business days to get in". It's fun enough when you can get to play though its a bit repetitive, a bit grindy and a bit thin on content (though more is said to be on the way). Make sure to have a book or blog site open to read while waiting to actually get into the game.