campaign is AMAZING. The one thing I like about multi is that for every prestige you get another custom class. Its also not that hard to level up considering all the extra points you get.
The bad thing about multi is the health, assault rifles, camping and the model 1887's. For one they have to take the 1887s out completely because they are the only weapon that is waaay overpowered. As for the camping, health and assault rifles all they have to do is fix one of them and maybe add more sway + recoil to the assault classes. If they add some health people will stop camping as much, if they fix the assaults people will stop camping as much. Easy fixes if you ask me.
Other than that this game is incredible and I doubt I will stop playing even if they dont fix those big ass flaws lol.