No spoilers
Campaign: the campaign is short, i played it on veteran difficulty and got through the game within 4-6 hours. The characters felt like cardboard cutouts and the game was trying to make them cooler than they actually were. If I hadn't played the original me trilogy I doubt I'd even remember the names of the characters. Positives are the graphics are really good and of you're looking for realistic graphics you'll be happy.
My main issue with the game however is the online which is supposed to be the meat of the game for most people including myself and I did not have a good time with it at all. I think the maps are badly designed and far too small, you'll respawn and sometimes just spawn in the middle of a gun fight and die as soon as you spawn, this happend to me on several occasions. The snipers and hunting rifles are ridiculously overpowered and in plagues every game, with all the new add ons to increase ADS and taking the scope off the snipers and one shot everytime. I personally think they are broken and really ruin the experience of the online.