The main problem (already pointed out by many) is that these brackets are a prescription, not a recommendation. I.e. there will eventually be tournaments in bracket 3 (or even bracket 1) and, as soon as that will happen, competitive decks will pop up there as well. They're not solving anything, they're just scattering the player base.
Trying to be as constructive as possible, I see many other minor issues, like no reference to stax (apart from some cards listed as game changers). I mean:
Armageddon is a no, but what about
Smokestack?
Also, it's weird that they've listed the game changers but not the land denial section. That would have been much easier. Ex: what about
Static Orb or
Thoughts of Ruin? What about
Crucible of Worlds +
Strip Mine etc?
Also, the 2-cards combo concept is too vague. I didn't read the whole article (because I'm going to ignore the whole thing anyway), so correct me if I'm wrong, but did they mention stuff like
Isochron Scepter +
Dramatic Reversal? Not even among the game changers, I believe. That's because technically it isn't a 2-cards combo: you need some mana rocks and an outlet to win the game. So am I allowed to play it in bracket 1?
Also, any 3-cards combo where one is your commander is virtually 2 cards, combos that require a lot of mana (like
Exquisite Blood +
Sanguine Bond) aren't really an issue etc. etc.
And what about non-determinisric combos like storm,
The Gitrog Monster and
Krark, the Thumbless? Are they allowed?
Another thing that really bugs me is the absence of
Tooth and Nail. OK, you might say
Kiki Jiki, Mirror Breaker +
Pestermite already counts as a 2-cards combo, but what if I fetch
Avenger of Zendikar +
Craterhoof Behemoth instead? What does it change from casting
Expropriate? Yet
Expropriate is a game changer and
Tooth and Nail is not.
To me, they're just trying to "get well" with as many people as possible, without any real interest in solving anything.