So much work must have gone into the puzzle & level design; the two come together seamlessly to create a compelling visual masterpiece.
With that much I can agree. As a game though, The Witness left me strangely cold. There is no real sense of mystery or danger, and the challenges all feel very artificial. It's basically a walking simulator with "Sudokus" thrown in.
Different strokes for different folks I suppose.
I found the lack of danger a relaxing change of pace (having just finished Doom[2016] on Nightmare, this was welcome).
Didn't feel there was a lack of mystery though; the levels are absolutely riddled with secrets (heck, a full ~10% of the game's content is hidden behind two rather obtuse secrets!), and then there's the thought provoking quotes & movies littered around.
I suppose it has no story to speak of; something that Talos Principle did really well.
The aspect I appreciated most was the way many of the puzzles tied into the environment; solutions relying upon clues in the environment, solutions affecting environmental change, or (in the case of the glyphs) the environment itself becoming the puzzle.