I don't really know anything about WH40k but I'm having a good time with Darktide so far. The gloomy grimdark megastructures and silly tech-gothic design flourishes are up my alley, and I feel like it really nails the abject terror of throwing everything you have at a horde and still slowly losing ground.
I find the worldbuilding weirdly compelling in a bleak edgelord-y sort of way—though it probably helps that you experience it as a disillusioned nobody who is very much being thrown into the meat grinder.
Unless you're a Zealot, I guess. I'm not sure I can stand playing Zealot.
