Dream Warriors is my favorite, and the one that introduced me to the Nightmare series.

Then it's the first one and then Freddy's Revenge. Even though every one says it's the worst and/or gay sequel in the series it had some good scenes, like when Jesse screams you can see Freddy looking out of his mouth.

The rest seemed like camp and the New Nightmare, which was supposed to bring the series back to being scary, was one of the worst. The premise was good (new glove, new look, what if Freddy was real) but just didn't translate well IMO.