Very large levels with a ton of optional missions on each map. I play it very stealthy, silenced pistol that I use a lot, and use a silenced sniper rifle rather than wait for sound cover. You can trap bodies as well as generators. It can get hairy if you’re sighted, but there’s a lot of cover to hide in until the search is over.
It is, of course, a sniper game, and that is the main weapon you will use to clear a path to your objectives. You can minimize the shooting but you won’t be able to eliminate it.
And it is a GREAT Co-op game. You can play the entire game in co-op mode. I’ve been doing that with my brother and it is a great experience.