Polygon: 9.5/10
https://www.polygon.com/2017/10/26/16551724/super-mario-odyssey-review
For a character nearing 40 years old, it’s amazing that Mario has remained not only a beloved character but one whose games are generally expected to be great. From that perspective, it’s no surprise that Super Mario Odyssey is, yes, a great game. But more than that, it’s a fantastic, even fundamental addition to Mario’s legacy. From a plumber to a doctor to a tennis star to, uh, a Goomba, Mario has endured. No, this will not be the last Mario game, but it is almost certain to be lauded as one of his best.
Eurogamer: Essential
http://www.eurogamer.net/articles/2017-10-26-super-mario-odyssey-review_8
Super Mario Odyssey has been put together with such generous abandon that you do wonder if quality can help but give way to quantity. Maybe it does, a little. Sometimes you will come across an idea that strikes you as ordinary, that you might have seen before somewhere else, or that hasn't been polished to the jewel-like perfection it might have attained in Super Mario Galaxy, say. But that is only true by the standards of other Mario games, and neither is it entirely a bad thing. When designers have flawlessness as their goal, the path leads through diminishing returns to something as gorgeous yet disappointingly sane - almost sensible - as Super Mario 3D World. Mario's makers really needed to let their hair down like this.
Besides, there is nothing like a new Super Mario to remind you that
there is no other studio that can make games like this. Jump on a tomato in the Luncheon Kingdom and watch how it splats out into a sizzling hot pool of sauce; ride a Jaxi, a stone steed as fast as a rocket, and watch the way it scrabbles frantically at the ground as you try to rein in its boundless speed. Then release it - whee! The happy revelry that has gone into the making of this nonsensical world is infectious, while the return to the open design of Super Mario 64 has freed all that gleeful energy in a sloppily explosive burst. To many people, Mario is video games. To play Super Mario Odyssey is to remember why that is.