So I'm playing it now, and...
Oh god, this game is so not smooth. Timing on attacks and counters somehow feel both too early and too late, and the feedback you get (if you get it) doesn't really help let you know either. The training dojo doesn't seem to work completely right; in one of the countering lessons the Foot soldiers wouldn't even attack, so I had to find a way to trigger them "right" so they'd both attack at the same time so I could even try it, and if I didn't get it I'd have to exit training and go back into the lesson because they'd never attack simultaneously (let alone in close proximity) again. Then I'd have moments where I passed a trial accidentally and had no idea if I actually did it right. Even if I did, it probably didn't feel right.
The controls in this game are... weird. Mostly because of the responsiveness/feedback issue. It wasn't always clear if I was using a special attack until I hit somebody with it, and still seemingly only half the time then. I couldn't manage to figure out any team attacks (though Splinter said I used one at one point, still not sure why) and I only really got one special attack to work. I think.
All I really ended up doing was that training stuff and a bit of the Challenge mode, but after a short while I had to stop. It just did not feel right. It's definitely not the Arkham-style Turtles game I was hoping for, that's for sure. I'll return to it sometime, but damn, that was a really awkward first impression.