Dont bother, it is boring. You are basically on the one map for ages doing little missions, which sounds great in principle but none of it seems like you are doing anything. Loved the first ones, this one is boring as fuck. Played the first map to completion and a bit into the second one then haven't went back to it (mind I did get Star Wars and RDR2).
The Sniper Elite games are fun if you don't mind a bit of sneaking about and preparing. Frustrating when you get found and have to hoof it to another spot and wait for the guard patrols to settle down. But when it all comes together it's fun. Plus- slow motion action replays of bones and organs getting decimated by bullets - always fun!
3 and 4 are the better ones, 1 and 2 are cheap on Steam (if you're on PC), but clunky and not aged particularly well.