100 
Edge Magazine
This isn’t a game that redefines the genre: this is one that rolls it up and locks it away.
100 1UP
Takes everything its predecessor did and maintains that urgent sense of wonder and discovery, creating a world that copies its past self, yet keeps the freshness that made it so exciting when the first game debuted two years ago.
100 IGN
Consider me “wowed.” Again. Yes, Super Mario Galaxy 2 is more of what made the original so amazingly good: brilliant gravity platfoming. Incredibly tight and responsive controls. Fantastic musical score. But it’s not a “me too” experience -- a significant majority of this sequel is brand new.
100 Games Radar (in-house)
Expanding on the original’s brilliance, this ingenious platformer only gets better by embracing the Wii’s limited capabilities and adds so many ideas, big and small, that we can’t help but love it. Even if you (mistakenly) believe it’s too similar to the first game, what’s wrong with more of an incredibly great thing?
100 The Escapist
Super Mario Galaxy 2 doesn't tinker with the established formula very much, but we didn't really want it to. It's huge, brilliant, and gorgeous. It's why you started playing videogames in the first place.
100 Digital Chumps
Even the harshest critics will struggle to find fault in its symphony of imagination, execution, and polish, while fans will cherish its brilliance for years to come as one of the very best games in history. Quite simply put, Super Mario Galaxy 2 is the reason I still play videogames.
100 Kombo
Super Mario Galaxy was a triumph, but the sequel manages to take things to a new level of excellence by adding new material as well as fixing elements that, in hindsight, did not appear to be broken.
100 Giant Bomb
For all the meaningful changes and additions that have been made, this is still more Super Mario Galaxy--which is to say that it looks and sounds about as good as a game for the Wii ever has, with consistently inventive level design, and exceptionally responsive gameplay.
100 GameSpot
Super Mario Galaxy 2 is simply an outstanding game. It never rests on its laurels for a second, constantly presenting new objectives and mechanics to push you to never before seen places. Even the two-player mode offers new abilities and delights, making it even more fun to play with a friend by your side.
100 Nintendo Life
Every once in a while a video game comes along that's just so spectacular that it ends up defining the very system it's released on and raises the bar by which all other games in the series and genre will be judged. It's safe to say that game has now arrived on the Wii console.
100 Kikizo
A whiff of expansion packishness aside, Super Mario Galaxy 2 is another breath of fresh air in an oppressively and perhaps misguidedly ‘mature’ gaming climate, a chubby, blue-eyed God among chest-bumping, photorealism-brown, cover-seeking insects. Whether you own a Wii or not, there are, quite frankly, no excuses.
98 Cheat Code Central
One of the best qualities of SMG2 is the speedy gameplay and the multitude of levels spread out into several different worlds within an ever-expansive universe. Even when you think you're done, you'll realize there are plenty of unlockable galaxies you'll get to explore with time.
97 Official Nintendo Magazine UK
If you loved Galaxy you'll adore this. Yet another dazzling high-water mark in Mario's career. [June 2010, p.75]
97GameTrailers
There is more creativity in some single stages in this game than in entire other games. It's a bit familiar, but all the fat has been cut away to expose a pure gaming core. There's something for just about everyone and games that we can truly recommend to almost everyone are rare.
95 NintendoWorldReport
It is the truest sequel Nintendo has produced in over a decade.
95 Worth Playing
While Super Mario Galaxy 2 could easily have been a cheap cash-in with a few lackluster additional levels, it manages to be something more. It expands on the gameplay of Super Mario Galaxy and adds enough new twists and turns to feel like a full-fledged sequel.
93 Computer and Video Games
More imaginative, more challenging, more fun... more of the (brilliant) same.
93 Game Informer
Super Mario Galaxy 2 throws something new at you nearly every single level - and with over 240 stars to collect, that's no small feat. [Issue#206, p.94]
90 Wired
Simultaneously more and less than its predecessor. It expands and elaborates on the gameplay in unpredictable ways, but the last one felt like a bigger, more complete adventure. That said, better core gameplay with less window dressing is infinitely preferable to the reverse.
90 GamePro
Galaxy 2 is a constant deluge of fresh ideas that are successful -- not because of its place in a franchise -- but because it is wholly willing to reinvent itself on the fly.
90 GameDaily
Super Mario Galaxy 2 is largely more of the same, and that helps make it a phenomenal experience. Nintendo didn't reinvent the formula. Instead, it took what fans loved about the prequel and then jazzed everything up with never before seen galaxies, planets and a more streamlined user interface.
Source : http://www.metacritic.com/games/platforms/wii/supermariogalaxy2
Soi 97/100.
