Kotaku (well, actually Stephen Totilo) so far;
is not a big fan of it and said that Tetris DS is superior in everything.
Other impressions I've seen around might share some of the complaints, but still say it's a good Tetris game. Totilo is not as happy though:
There is an outfit called The Tetris Company. They enable a game to be branded as an "authentic Tetris game." These games were both authorized.
I have not asked them, but I believe that, by having the ability to allow Tetris games to exist, The Tetris Company also has the ability to make them no longer exist. Hence: you can't buy a new copy of Tetris DS anywhere. It's been out of print for years. On paper, they did the right thing, letting new companies like Majesco, Hudson and EA make new Tetris games for DS, PSP, iPhone, you name it... but sometimes the game they made in 2006hell, the game Tetris inventor Alexey Pajitnov made in the mid-80'sis great enough.
If you're going to get a Tetris game for the 3DS, remember the thing you may have already learned as a 3DS owner: it's not the 3D that matters; it's not the year the game was made... get the great one. Get 2006's Tetris DS.
(Note: Tetris Axis will be out on October 2 and, to be fair, it does have online multiplayer that I wasn't able to save. That might help the game, but I doubt it'll change the fact that, at best, this new Tetris is an ambitious mediocrity. 3DS gamers deserved a better new Tetris, because, whether hardware is good or bad, you can always have a great Tetris on it.)
I'll get it anyway.