Pulitzer-prize winner Stephen Hunter:
"all of it at least makes some kind of coherent sense but maybe that's
just the grown-up in me, searching desperately for those desperate
props called "rules." It's a far grittier, grungier kind of New York
than in the previous films, and the detail has been worked out to a
thoroughly impressive degree. In fact, as a piece of film design, the
movie is first-rate; on sheer aesthetics alone, it rivals "Triumph of
the Will" for astonishments.

As a movie rather than a design exercise, it's also not without its
pleasures. The vocal performances (Patrick Stewart, for one; Sarah
Michelle Gellar, for another, and Ziyi Zhang for still another) are
vivid. The action sequences are excellent, particularly a dust-up
between Raphael the "maverick" and Leo the deposed and now returned
"leader" of the turtles.

Only on one issue does "TMNT" pretty much flop. That is its plot. Or
rather its plots, all 16 of them. It gets off with a big splat, a
chunk of exposition so dense not even a 13-year-old could stay with
it. The upshot is that the film is technically superb and quite
enjoyable as long as you don't bang your head against the plot."

And from occassional Ebert & Roeper Guest Critic, Michael Phillips
(Chicago Tribune):

"Besides being lame, cold, ugly-spirited and hard on the eyes, "TMNT"
should've gotten a PG-13, since it's all head-banging and assaultive
frenzy disguised as a story of how four brothers learn to fight as
one.

"To be fair, blood isn't the name of writer-director Kevin Munroe's
game. Neither is cleverness or invention.

"In between "Death Wish"-style excursions designed to rid New York
City of its criminal vermin, now and then one character accuses
another of glorifying violence, "that brute vigilante junk." Talk
about hypocrisy: Without the brute vigilante junk, this 82-minute
picture would be approximately 2 minutes long."

And former Ninja Turtle fan cum Entertainment Weekly Critic, Gregory
Kirschling reports:
"it burns to report that this all-CG reboot is missing the goofy
excitement of the old TMNT. By way of meager update, our green crime-
busters now fight a messy panoply of villains and monsters instead of
the fearsome Shredder, and sidekick April O'Neil (the voice of Sarah
Michelle Gellar) trades in her yellow pantsuit for 21st-century Lara
Croft gear. Also: not enough pizza. C+"

Terrence Briggs, asking who the bloody hack does Ziyi Zhang play?
Karai?
Peace to you...