Welp, not bad. A little heavy on the corny jokes, but not as much as TOS or the '03 series from Fast Forward on. The whole "bickering teenagers" thing rings true. Didn't really need an entire scene devoted to the origin story of pizza.
Talking of origin stories, I haven't been following the current comics series but it looks like they're going with its kinda hybrid of the comics Splinter origin and the original cartoon version -- Splinter was originally a human. (Calling it now: Karai is his daughter. Though I'm pretty sure everybody else has also immediately worked that out.)
I liked the designs, overall. Snake is the most Kevin Eastman character design ever.
I think making April closer in age to the Turtles is a sound idea. But if you want to ratchet down the general weirdness of a thirtyish woman spending all her time with 15-year-olds, well, changing her into a 15-year-old human crushing on a 15-year-old mutant turtle is perhaps not the best way of doing that.
Could have sworn that was James Avery as the Kraang, but the credits said Nolan North. Still and all, that's one more TMNT alum -- and indeed one more former Raphael.
Only really had two moments where "BUY THE TOY!" jumped out at me. So that's good. But give it time.
On the whole I think the '03 series set the tone better, but this isn't bad. I may stick around for awhile. See when Casey shows up.