To assist those individuals trying to make the most informed purchasing decision possible, I've helpfully compiled what I feel to be a fair and representative collection of excerpts from the higher profile reviews.
Gamespot: "[the game] is prone to... bugs and visual glitches... perpetual loading screens... jarring... pop in."
Game Informer: "... long load times. Breakable weapons interrupt the adventure. [Ciri sequences] far from exciting... locations difficult to access, lacking good fast-travel locations. Witcher sense... overused... [ending] rubbed me the wrong way, disappointment lingered long after the credits rolled."
IGN: "main quest... mundane, even perfunctory... technical [caveats], 30fps... too much to ask, transitions between maps... too long... glitches... pop up. ...too much padding in the form of meaningless fetch quests and collectathons."
Kotaku:"...shortcomings in the enemies' artificial intelligence... the developer's technological ambitions... overwhelm the PS4's capabilities and the frame-rate and responsiveness become a real problem... inventory management... a real mess."
PCGames.de: "Spreche Meinen besten Dank aus... Chr. Rex"
I haven't had a chance to see how the actual numerical scores are shaping up, but assuming that these excerpts accurately represent the prevailing sentiment, well...