The best way to embrace the true greatness of this game is to look how the series have improved since the first and second part of The Witcher. You simply won't find anything that didn't change for the better.
- Vast open world that IS NOT randomly created and filled with dull stuff,
- Story that engages your from the first 10 minutes to the very end,
- Graphics that despite the whole controversy of a thing called downgrade still makes from this game THE BEST LOOKING RPG ever created,
- Soundtrack that finally goes back to the style presented originally in The Witcher 1, something that makes you forget that's just the video game, it gives you the felling you are in there, in some village or a city or that you are fighting with someone / something which makes from every single battle an unforgettable thing,
- Every single side quest and believe me there is A LOT of them is simply a little story that keeps you playing with the same force as the main quests - I call it a new quality in RPGs,
- Choices and their impact on the story - even a small choice that seems insignificant at the time can wage on the whole world around you,
- THIS GAME IS MATURE, finally something that deals with a lot of subjects that are usually handled very childish or not at all,
- Combat - nothing more to add it's good, though it's nothing to be praised really, you won't be able to mash buttons and win - you have to dodge, use signs, and on higher difficulties get yourself ready to have an oil for a specific enemy and a bomb to put an end to his misery.
The Witcher 3 is not a game without it's flaws though nothing that can't be fixed - some balance issues, economy that basicily shows Geralt as a very wealth person which he should not be, small performance problems like stuttering in Novigrad and in my opinion very limited after the end content. Many of the things that I struggled with have been already fixed and there is no need to disclose them.
All in all one of the best games in the last few years (even a decade).