I hate to say it but if you are looking for SP action then any of the bf series isnt gonna satisfy your needs. Bf was built as a multiplayer game and they just added the singleplayer onto it towards the end. Just based on time id guess that bf2 has the best multiplayer but i guess not from what you have said, and i havent played singleplayer since the sp demo for '42 so i cant really tell from my experience.
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