The Witcher
The Witcher 3‘s high quality is a blessing and a curse for the series as a whole, not least of which being that it complicates whether you should play the series out of order or not.
While The Witcher and The Witcher 2 are each good games in their own right, and should be played in order for maximum impact, neither comes close to the quality of the Witcher 3 in terms of gameplay, storytelling or most any other factor.
A big part of this is the fact that developer CD Projekt Red learned an impressive amount from their time developing the first two titles in the series, and applied that toward making The Witcher 3 the best it could be.
As a result, those wishing to play the series’ best entry first wouldn’t be remiss in starting with the last entry in the trilogy.
They’ll be treated to the best of the Witcher’s lore, side quests and story beats, all while being introduced to key elements and characters of the world that will serve them well when going back to the first two games.