I had a lot of fun with CoD, but it's a totally different game than BiA.
CoD is so far fetched in it's portrayal of WW2 scenarios it's not even funny. Might as well completely eliminate squad mates from CoD because they're pretty much useless. I can remember the frustration of having some Kraut shoot me from behind in the same room as me, all the while my squad mates stood there looking stupid and not doing anything.
In BiA I've actually tested the teammates' AI, and have finished entire levels without me killing a single enemy, just relying on my fire/assault teams to execute flanking and assault maneuvers.
BiA makes you aware of the toughness of war, CoD sensationalizes it by often times pitting a lone soldier against scores and scores of enemy forces.