is this game multiplayer or single (both) and is it a bit like rainbow six siege where i don't have a clue whats going on
Well like I said it depends really. You can play this on your own with a ai squad that will sometimes do what you want, but I will admit the ai ain't bad in this game they can bear very smart and sometimes not just walk into your car instead of get in it. I think this game is better played with actual people, this way you can make plans or just go in guns blazing and make a small many explosions as you can do
( cama)
Also one good thing I found of this game isn't that if you joined another persons game and then went into your single player an hour later, all the work you did in there game has happened on your game aswell. If you killed a boss then it says you killed in on your single player world aswell.
As far as the story, it's very easy to follow and you will know what your doing as you go around the map doing all your missions and side missions( if you want to ) it's not as tactical as siege but is more tactical on a wider base due to it being open world instead of CQB style tactical