Sebster you don't seem to have a clue what you're talking about, have you even played the game? Magnum Ammo is a straight up damage boost, there is nothing not to like about it. And shotguns in this game are ridiculously accurate for a videogame depiction. All shotguns but the 870 combat are OP as stuff, and the 870 is totally worthless.
forgetin saiga.
oh yeah pros and cons
Pros:
Teamwork oriented.
It's Battlefield. Full stop.
Cons:
Victory relies on teamwork
I miss the amount of chatter from the other Battlefield games, not hearing spotted enemies, command post notifications, new orders, people calling for a medic, etc.