Beyond all that it is just great story telling and a fantastic tale.
Plus it has a cool monster.
The Monster, called "Demogorgon" after our favorite two-headed demon prince, is a true monster. It is hard to see, hunts and kills people and can smell blood anywhere. I am not going to spoil it if you have not seen it, but sufice to say it is a great monster.
Great enough in fact for AD&D. Here it is, with some artistic liberties taken.
The Monster
AKA: The Demogorgon
Frequency: Very Rare
No. Appearing: 1 (believed unique)
Size: Large 7" (L)
Armor Class: 5 [14]1
Movement
Basic: 180' (60')
Advanced: 18"/27"
3e: 45ft
Hit Dice: 8d8+4 (40 hp)
% in Lair: 50% (hunting at night, hiding in the Border Ethereal)
Treasure Type: None
Attacks: 3 (claw/claw/bite)
Damage: 1d6+4/1d6+4/1d6
Special Attacks: Scream (as fear spell)
Special Defenses: Ethereal Projection; Immune to all gaze attacks, blindness; regeneration
Save As: Witch 102
Magic Resistance: none
Morale: 103
Alignment: Chaotic evil (animal)
Level/XP: 8/4,250 + 12/hp
STR: 19 INT: 10 WIS: 8 DEX: 16 CON: 20 CHA: 6
1 Descending and [Ascending] Armor classes are given.
2 This is used for Basic games, and S&W. Also for monsters that I think need to save a little differently than others.
3 Morale is "Basic" Morale and based on a 1-12 scale. Multiply by 1.6667 for 1-20 scale.
The Monster, known by locals as "the Demogorgon" is not a demon, or even related to demons. It is a native of the Border Ethereal known as "the Upside-Down" and really not much more than an animal. It is a rather terrifying animal with hunting abilities similar to that of a shark. It has no eyes, it's entire head opens up to a large mouth, it can smell and even taste blood on the air like a snake or shark would.
The Monster is a nocturnal hunter, not because of fear of light, but it is when it has advantage over it's prey. It seeks out it's prey, large warm blooded creatures, and drags it back to it's lair in the Border Ethereal. There it can feed at it's leisure.
The Monster can heal itself at the rate of 2 hp per round.
Don't forget to include the hashtag #MonsterMonday on Twitter or #MonsterMonday on Google+ when you post your own monsters!