I didn't beat TMNT on the NES (cleanly ) either, for some reason I find NES games really solid to beat now
Also I wouldn't say OoT was perfection, it was the best Zelda game, but i'd just like it to be like twice or three times as long, like a Final Fantasy or Secret of Mana game usually is
Although I guess with no levelling up and shit, you can't really have that in a Zelda game
Most Zelda games feature their own form of levelling. increased hearts, stronger weapos, better shields...