Sometimes this kind of thing just happens. You don't have to automatically love something because it's receiving near-universal praise, and that's okay! Doesn't matter whether or not you can pinpoint a reason (or reasons) why you aren't gelling with a certain piece of media - the fact is, if it's not doing it for you, it's not doing for it you.
You say you've given it a few tries and that's commendable. Perhaps you can play some other games right now and give
Witcher 3 another shot later if you feel so inclined.
This kind of thing happened to me with
The Exorcist. First time I saw it was during my freshman year of college, and I thought it was a boring piece of crap. Ten years later, I was reading a lot of articles about horror movies and, since
The Exorcist almost always ends up at the top of every list of the best horror movies of all time, I gave it another shot. Nope. Still hated it. A few years after that, once again engrossed in articles about the horror genre, I thought that maybe, just maybe, there was SOMETHING I missed the first two times I watched
The Exorcist. Nope. Couldn't even finish the movie. Boring as shit. I don't understand its appeal.
But then there's
Mama, a horror movie I saw a few years back and didn't care for. About two weeks ago, my brother asked if I had seen it and I replied that I had, but I wasn't overly impressed. Then, just last night, I was watching movie reviews on a few YouTube channels, and I stumbled across a video analyzing
Mama. Turns out it wasn't really analysis... this poorly named video did nothing more than show every scene in the movie in which the Mama character appeared. But something about that video made me think I should give the movie another try. Maybe, just maybe, there was SOMETHING I missed the first time I watched the movie! I turned it on this morning, and I was blown away. I really
had missed something. Damn, that was a good movie.
These kinds of things happen.

Don't kick yourself over it.