story and order missions first, then Multiplayer
This game revolves around how you make your own AC (armored core) and act as a Mercenary, doing missions to earn money depending on the rank that you earn, ranging form E to S.
It is Heavily recommended to play this game with an internet connection (not even sure if its possible to play without one)
It is also recommended to complete as many order missions and story mode as possible before trying to play in a multiplayer match, because as you progress through the game you unlock parts that allow you to customize your AC even further, could be a light AC focused on mobility, a balanced AC focused on the most basic actions, a heavy AC focused on Pure fire power, Special armor to counter a specific damage type, there are just too many options to list them all here...
whatever you like, its your choice and all are tactics and builds are Viable.
The multiplayer aspect of the armored core series has always been it's strong point, because your creations are put up to the test VS the creations of others, may it be a Duel, a team match, or Battle Royal.
I give this game a 7.5 out of 10 because the story mode isn't that long, Order missions aren't that interesting considering it gets repetitive a bit too fast, and because there is not really much balance when it comes to the weapons types, you get about 10 different weapons per weapon type, but there is always that one weapon that shines among all the others of the same type (or maybe i just limit my self to those weapons considering my play style involves high mobility/sniping)