While I respect CDPR's dedication to the craft, I've always had a hard time getting into the Witcher games. I completed the first one, which really felt like a poor man's ARPG in a lot of ways but was fun none the less, but they really lost me with W2,where the game looked like it was supposed to be a Capcom like hack n slash with depth but Geralt controlled like he had just gotten done being crucified.
I fired up W3 for an hour or so but just felt lost and uninterested. I know I will come back and beat those games, maybe they handle better with a controller rather than KB+M, but it definitely gives me pause.
I hope Cyberpunk is not only up to the rep the Witcher games developed for story, but shows CDPR can make a fluid and fun game with solid gameplay mechanics to go along with it. A Cyberpunk Skyrim with an actual story, choice and consequence. And techno noir.
I never could get into the first Witcher...though I think I put maybe 12 hours into it. Eventually I just quit playing. Combat was terrible and I let myself get into "bag efficiency crafting ordering hoarding" phase and I just had to stop.
Witcher 2....very different. I hated it at first, then came back some years later, Started again. I agree with your description though--everything is on rails and your open world truly isn't open. ...the combat isn't great, QTEs, all of that nonsense, but I ended up enjoying it. The story, I mean, I wasn't that into it, a bunch of political bollocks as I call it, but many loved it.
I felt Witcher 3 was a whole different world, though. The combat can get very samey after a while, and it's easy to get into a groove and, even on Nightmare mode !midway through, it can still be rather easy once you get the hang of things...but holy poop what a gorgeous world and story and everything about it. I did 2 full playthroughs--with NG+ and then all the DLC on the second playthrough. I didn't think I would do that but I did.
I did eventually use the Xbox gamepad for Witcher 3, though. I think KB & M is fine (Actually, first playthrough on KB/M, 2nd was with gamepad), but it just plays better with gamepad imo, even though you are stuck with analogue junk for the movement.