There's a MoW spinoff series called Call to Arms, and while that game is a bit of a F2P/P2W mess Ostfront, it's WW2 "DLC" that's also a form of spiritual successor to Assault Squad 2 is pretty good and really reminds me of the original CoH with it's dark and grim atmosphere and feeling.
We also made a mod called MACE for it which adds additional units for Germany and soon for the Soviets as well as the US as a new faction, which they are coincidentally also adding in another DLC expansion to the game so I can recommend it to everyone here to try it out.
Coh1 never had a "grim" and "dark" feeling.
COh2 had it. Especially at launch. When everthing died to to everything in mere seconds. One mortar round? Kills half a squad. Blizzard. Kills the last guy on retreat. Vision? Zero. Katyscha and Pwerfer BArrage. Army gone.
That was dark.