The Witcher is okay for me. I appreciate the world-building and the monster designs and the characters. However, video games are always about gameplay for me. Otherwise, what's the point? You can get world-building and plot-driven entertainment from all kinds of media including paper books, audiobooks, movies, television, comic books/manga/graphic novels, writing yourself, etc. It's the interactive elements that separate video games from other mediums. In that respect, The Witcher 3 was a bit tedious for me.
It feels like it takes so long to get anything done and even though the combat system isn't anything too complex, it's deep enough that you feel lost if you go away for a long while and come back to it. Between that and the story I felt the need to start over from scratch the last time I stepped away from it. I think that's a bad sign for a game's gameplay if you can't just pick it up and get the feel for it after a time away from it. Otherwise, the game feels like a project you can't step away from.