I mean if it's not your kind of game then refund while you can. I personally played it coop with a buddy and my fiance and absolutely loved it. It was about 25-30h for the three of us, with lots of exploring and puzzle solving. The combat won't change too much (general mechanics I mean, new weapons and skills will change it a bit but if you don't like the handling that's just mostly how it is).

As far as the mouse goes, the game has negative mouse acceleration forced on with no option to turn it off. How a game company can make a pc shooter and leave negative mouse accel on is beyond me. But there is a mod you can download somewhere on nexus that fixes this issue. There is a separate issue that causes your frames per sec to affect your mouse aim and changing graphics settings can wildly affect your sensitivity. Idk if mods can fix that part. I ended up refunding the game after about 2 hours of play because of all that plus getting soft locked and having to restart in the first 10 min

However if youre interested in playing on controller i have heard it works very good. I just can stand playing shooters on controller