Yeah, I've seen all of them and have them all on DVD. The first one was great, second and third ones were good, fourth one was okay, and the fifth one and Freddy's dead were a step down, although still watchable. I thought Wes Craven's New Nightmare was a really good one, though.
What makes the Elm Street movies better than other slasher movies is the character development, and the fact that there's more creativity going on, as well as more of a plot. As I've grown older, I've begun to dislike the old Friday the 13th and Halloween movies becuase they seem so mindless and virtually absent of a plot. I used to love them, but as I've grown older, I've stopped liking them and learned to appreciate the elm street movies more for their creativity.
At first, I was really angry that they were remaking Nightmare on Elm Street. I'm sick of remakes, and I feel that they should just let the original stand on its own and not try to modernize it or destroy its legacy. I used to be a big Friday the 13th fan, but I thought the remake was really awful. I'll probably see the elm street remake at some point, hopefully in the theater, and I hope it's much better than the Friday remake. I'd rather they would just try to do another sequel than try to reboot the original. It usually turns out awful that way. But hopefully it will be better than I expect. I'm against the idea of remaking this movie, but as a dedicated horror and elm street fan, I'm willing to give it a shot.