Okay, I saw this movie, and I'm not going to lie, though my opinion is most likely going to be in the minority here. Here it goes:
I didn't hate it. In fact, I even liked the new Turtle's personalities and whenever they were on screen. Each Turtle at least gets one moment during to show their personality (even though, yes, it does reduce Mikey to being a walking Pop Culture jokester and April admirer) Yeah, some of the CGI looks a bit... sketchy and Splinter looks really off (though I did like him using his tail in combat). I even liked some of stuff they give to Raph and Leo's relationship.
But everything else, from Kids deserving better and whole parts lifted from the Amazing Spider-man, I absolutely agree with. This movie's story is worthless. It's funny how there's this huge disconnect where April is actually much more interested in where the Turtles came from than the Turtles themselves. Unlike TASM, where 'it's connected' makes more sense since it concerns our main character of Peter Parker. Since April 'isn't' a giant anthropomorphic turtle with Ninjitsu, the movie has this huge disconnect, where April deals with the stuff that's actually related to the plot while the Turtles are there for brand management and to do ninja stuff.
It's almost a fascinating study on female protagonits and how to botch it up: April is the driving force in this movie in terms of story, but since she 'isn't' a gigantic turtle, she's left out of the marketing while the Turtles, who are essentially background characters, are at the forefront of marketing and action scenes.