The fact that the single player mode is little more than an extra bit on the side becomes perfectly clear when you look at the main menu of the game. If you were intending to buy the game for it’s single player mode, then you’d be better off looking elsewhere: the campaign lasts 4 hours and really isn’t worth it. There are lots of pre-programmed scenes, enemies with limited AI, absurd dialog, and scenarios that seem similar to other games.
In Campaign mode, Battlefield 4 is a succession of levels that set out to impress the player.