The first TMNT game I played was the arcade one when it was ported to the NES. I played it with my brother and then by myself. It's still one of my most favorite Nintendo games of all time and everything a Turtles game should be. I remember not being able to sleep at night because I was so excited about playing it first thing when I got up.
I would play the first game for NES later and it was underwhelming. From what I understand it's average at best, but getting into it after playing II makes it that much worse. I'm not sure if there are any other Turtles games out there (please direct me if there are) but I decided to keep this open just in case. So talk about TMNT video games here!