Single Player vs Multiplayer vs Co-op

It happens to everyone, you’re playing the campaign and wrecking anything that gets in your way. One hundred enemy soldiers come at you? No problem, you’ll take them out with out breaking a sweat.  When you get into multi player that’s a different story though, you get wrecked for a few weeks until you learn the ropes. Oh you’re playing co-op? Back too demolishing everything..