What were your gripes, though? And I didn't even know there were major differences gameplay-wise btw PS4/PC and Switch version?
The differences weren't in the gameplay sections for me, but in loading, menu responsiveness, and framerate when looking at PS4 vs Switch, with the latter leaving an overall better impression. And the additional post processing options they included via one of the updates were a cool bonus over the PlayStation version, too.
PC obviously is on another level when it comes to aspects like that, though. But I never finished it on there, only the PS version.
What I didn't like (aside from the stuff mentioned above already) were the combat (I know, a rather heated topic for many, haha), the general feel of movement, the lack of interactivity with the environment (I think I simply like sandbox style open worlds significantly more), the character building/skill tree system, and the main story, which was lacking in my eyes and way less interesting than the side quests. Those on the other hand were sooo good, I don't think I've played another game to this day where I enjoyed the side content this much. I also liked the writing, characters, visuals and sound, the overall setting, the detective like gameplay aka Witcher senses and Geralt explaining what he was finding out.
Witcher 3 to me probably is the most storybook-like game I've played thus far, with all the strengths, but also weaknesses that come with it being such.