SPOILERS: The original "A Nightmare on Elm Street" is a straight up classic. What makes this film stand out is how well it holds up over time. There are a few scenes in the movie that still terrify today and I contribute that to the incredible special effects. Many of the scenes in this film were very progressive for 1984.
I was also impressed by the two lead characters, Nancy and Glen. Nancy, who is played by the excellent Heather Langenkamp, is one of my favorite "final girls" of all time. Not only is the character well acted but she is a heroine. She fights back and devises a plan of how to take Freddy down. Glen, who is played by the great Johnny Depp, is very well acted and plays a relatable character. Both Nancy and Glen play strong roles that aren't overly stupid (which is oh-so-common in the horror genre).