The worst part is, it wasn't so much a bad movie, so much as it was a movie with a lot of potential that was wasted. The bits with the turtles were genuinely good, but the whole buildup with April and Eric Sacks was dull an uninspired. It felt like they had a movie about a contagion conspiracy and threw the turtles in it to pad the timing out. Except it wasn't, which made it worse. The worst thing I think they've done was listen to the complaints about how Shredder was a white guy now (even though the intention was to have Shredder as an inherited title), and include Oroku Saki Shredder into the film. In essence, Eric took the role of Oroku Saki and Baxter Stockman (his would be first appearance in film), shoving actual Saki Shredder into the background. You can tell by his fascination with the Mutated Turtles. That was totally a Baxter Stockman sequence. If they made the entire movie the same way and replaced Eric with Saki and Baxter, it would have been a much less disconnected film.
But I have to admit, it has seeds of being a genuinely good movie in there, and I hope the first film serves as the infodump for a much better sequel. Other than that, I'm the only one that genuinely enjoyed the look and detail on the Turtles. They seem to have a vibe of mixing all the different styles of the turtles from the comics, especially Michael Zuli's realistic turtles work.
Yeah. on the one hand, I can see why they turned the second film more into the cartoon series, and I can see why they had to bow down to whining parental groups. On the other hand, a lot of the damage they did themselves. I get the whole excuse that they couldn't have it be a TCRI container and they didn't want to reveal the scientist was actually and Utrom, because kids would have been confused into thinking it was Krang. But the Shredder revenge plot wasted potential for any other TMNT villains to appear, and the ending with Mutated Super Shredder was too Disney to take serious or enjoy. Cuz that's what happens to most Disney villains, they get bigger somehow, to the point where Emperor's New Groove parodies it.
But the childish dumbing down was disappointing (retroactively anyway) considering how unapologetic in darkness the first movie was. They found the right mix of comic and cartoon, and it's one of the most accurate comic book movies out there. Remember... this is when Batman's film at the time said that Bruce's parents were killed by soon to be The Joker for the sake of the film, rather than Joe Chill in the comic lore. As for the third, while I don't regard it as a great movie, I find it closer to the comics than the second one. Almost a Tales of the TMNT type movie (like the fourth one was). Plus, it was great to see Casey back instead of the generic ninja kid from the last film. Too bad the reason they traveled through time wasn't because of Rennet. That seems like a lost opportunity.