Oh wow, what a joke.
http://pcgamingwiki.com/wiki/BioShock#Mouse_acceleration
It's fixable but we shouldn't have to edit ini files to fix basic mouse issues.
- There's mouse acceleration and smoothing that you can't disable. There were some tricks to do it in the original, but none of them worked perfectly.
- Mouse sensitivity is way too high, even at the lowest value (1).
- When you set the sensitivity to 1, menus and things like hacks become unusuable because the mouse moves slow, skips in random directions and doesn't allow you to click on menu items.
- There's a lot of tearing and enabling vsync adds tons of input lag (more than it usually does).
- If you have a controller plugged in, you get Xbox prompts even if you don't ever touch a single button.
ah yes i remember that from the original now and i can see it in the remaster. i have a rubbish mouse so having the sensitivity on 2 is ok for me. i'm not using vsync either. the acceleration is on the controller too which is a bit annoying. it always was no i think about it. if you have a controller plugged in 24/7 just turn it off in the menu. that works for me.