I only played it for the Campaign unintentionally when I found out you have to play Co-op to unlock Multiplayer guns.
...atleast that's what the game said to do
you play multiplayer to unlock multiplayer guns
but co-op allows you to unlock a few more, like the REX
with bf4 being a dlc for battlefield 3 meaning they will all be absolutely horrible.
is this sarcasm? because, coming from the resident call of duty lover...