Sorry you have had such a bad experience trying to play the game, I'll try to respond to your issues 1 by 1.
Accessibility settings are something we are definitely planning to improve in Patch 3.0 (The final release). We're still in early access and some of the final features and options aren't fully fleshed out yet. More control over audio sliders is something we've had requested a few times the last week and we'll probably get them added in one of the upcoming smaller patches. There have been a few issues with the options for some players as well, sometimes caused only on the first launch of the game. If you restart the game and reset keybinds to default hopefully everything should be working as normal.
Enemy readability is something we're planning on improving as well. Yesterday we released a small patch that made enemies stand out against the background more, and we have a few other things we'll try for upcoming patches to improve that more.
Performance is something we have been working on a lot lately and the 2.6 patch released this week increased performance by an average 30%. Most of my playthroughs I get an average 140-180 FPS on a 4 year old video card, but you definitely need a medium to high end card and processor to be able to play smoothly. I'm not sure if your laptop has a dedicated video card but if it's integrated graphics I'm not sure we'll ever be able to optimize enough for it to perform smooth enough.
Controls are something we have also improved a lot recently, particularly on controller. Most of the comments you read on controller I'd assume are from before patch 2.51, but after the controller scheme overhaul we've heard a lot more positive opinions on the controls. If you have issues with the controls on PC you should be able to rebind your controls, but I think some of the issues you have with movement and aiming are more due to the low performance on your computer.
If you were playing on patch 2.51 before maybe try to update to 2.61 and see if it's an improvement. Otherwise maybe try again when we release patch 3.0 later this year, but depending on your computer specs I'm not sure you'll be able to play it smoothly without a more powerful computer.