The new Ninja Turtles movie was neither terrible nor great. As it's own movie, I feel it botches a number of things, such as how terrifying the turtles are, that they are pretty much super heroes that don't even need ninjitsu, and that the threat balance is so out of whack. The foot clan are complete jokes because each turtle is like Captain America, but then they made Shredder so obscenely strong that they really shouldn't have been able to beat them.
Bringing in nostalgia, they got alot wrong with the story for no real reason other than they wanted to be different. Their outfits are great, their interaction is right on, the whole family aspect is right there and some of the action is pretty entertaining, but when you combine the above with the story problems and how Megan Fox as April was terrible, it just seems like a wasted opportunity. Some changes to the script and the turtles appearance could've made the movie a lot better.