If you haven't tried rising storm vietnam, it's really good, ArmA SOG Prarie fire also has a pretty cool mod that they have adopted for some really enjoyable content.
Lately I've been playing Everquest from back in the early 2000s. It still has a really large active player base, and population that raid, stream and I really have enjoyed the relaxing time it provides as an escape, as there is litterally so much to do in the game it can keep you occupied for hours on end.
Just getting back into the BF4, BF2042 is really cool, I enjoyed a little but of it, but I don't have the hardware on my computer to run it to make it really enjoyable, even BF4 is pretty laggy for me.