I thought about picking it up bit decided to wait. Likely a mistake given that it's off sale and might not go on again for awhile, but I can always pick up a physical copy Combined Operations at a discount -a quick search shows that it has already been marked down by $20 at some stores- and have an almost DRM free copy that's not tied to Steam (they got rid of the disc-check but FADE is likely still active). Plus I picked up Dragon Rising when it was $3 and so I'll get through co-op mode with that before I move on to a similar, although possibly slightly better -I've seen arguments on both sides-, title.
Well DR is a different genre than Arma, so no point comparing (DR does have tremendously sucky bits). I decided to just wait until Arrowhead is on sale and get it then.