Gunplay is mediocre as expected. Checkpoint system combined with resurrection drives me nuts. Constantly having to rely on the girl throwing you shit drives me nuts. Very boring vigors so far (I have 5). Toggle crouch/zoom, no option for holding. Inventory screen sucks. Some form of texture loading stuttering seems to be present with Nvidia GPUs. 1999 mode difficulty mainly stems from enemies taking enormous amounts of punishment before they go down which is a shame.
I was rather surprised to see that you get to keep the regenerating shield in 1999 mode as that's not very 1999 at all and just promotes typical modern hide and recharge gameplay. They really should have gotten rid of that instead of buffing enemy HP to absurd levels.
Overall the gameplay is average at best. It relies heavily on its storytelling/setting to get you to like it.