Reviewing a game that you've already played in some other form is usually pretty easy. And to be honest, it's rarely ever quite as good the second time around. These days, with everything being ported and translated, the chances of playing something twice are fairly good. I usually don't complain as remakes and ports are rarely done on bad games, but reviewing them isn't always exciting.
I went into this port of Knights in the Nightmare feeling pretty good about it, as I really liked it the first time around when it was originally released on the DS. But I didn't expect to like it more than the original. Still, that's what ended up happening.