It truly is one of the best games I've ever played. I had been following the series and CDPR since the original came out in 2007, and to see them grow each game was amazing to see. They absolutely knocked it out of the park with W3 and really fulfilled the fantasy of being a Witcher by giving us an open world and having proper sidequests that Geralt can stumble accross. The story, characters, soundtrack, atmosphere, art direction and so many other parts shine supreme even today imho. I also liked the combat though I've seen many criticize it, though I feel the criticism is fair. It brings Geralt's story to a wonderful close. That is, if you get the proper ending.
You see, if there's one thing I really disliked, is what they did with the "big" choices. That soured the experience a little bit for me. I'm in the minority of this I'm 100% sure, but without trying to spoil the story too much for the few souls that have yet to play it, there are multiple moments in the story where the choices you make, I felt, never really *seemed* to have big consequences. Atleast that's what my experience was like. There was an instance where I decided against allowing a certain character to throw a tantrum and that single instance gave me the bad ending. I couldn't fathom why such a seemingly small choice resulted in me getting the ending that made me depressed for a week. Seriously, the bad ending for Witcher 3 is NOT for the faint of hearts, it's absolutely one of the most depressing endings to a story I've ever seen, not necessarily because it's "bad" but because it tears your heart out and stomps on it. Throughout my 100+ hours playthrough I did not at all think that I deserved that ending in any capacity. I immediately searched up on how these things work on Google and I got visibly upset. Loaded back to a previous save file, did the choice differently and boom, I got what was arguably the "best" ending. That was stupidly handled in my opinion. But as I said, I'm probably in the minority of all this and I AM jealous of all the people that didn't stumble like I did.
However even with that taken into account it remains an all time classic to me. Wonderful game. I AM glad that they improved on this aspect a little bit on Cyberpunk though.