DRG is the best horde shooter on the market right now in my opinion, and it's not even really close. Certainly nothing beats it in terms of charm or personality. The overclock grind can be a bit daunting if you commit to the long haul but I appreciate that it's all there to be earned without paying cash past the point of purchase. With the new season it's a solid time for new players too - kind of a shame it never really took off with streamers because it's a really great multiplayer/collab game.
Through what I assume is programming wizardry it's not even a 3GB download as well. Much better than the time I wanted to go back to Vermintide only to see it was 100GB+ and decided not to bother.