The original Friday the 13th has virtually nothing to do with the Jason lore the public knows today. And although the sequel is actually really effective in places (that ending is awesome), it also shows very little resemblance to the Jason we all know. It wasn’t until Part 3 that we get the hockey-mask wearing, machete carrying monster that has become a staple of Halloween store displays and corporate costumes.
This is also when things get ridiculous (well, maybe it was ridiculous from the beginning) but the murders become comically staged such as when a man doing handstands is sliced in half in the most jokey way possible. There’s also a Psycho homage scene in a shower that plays out in a pretty non obvious way.
None of the Friday the 13th’s are particularly brilliant (especially the horrible remake) but they are definitely fun and part 3 is when things became really entertaining and when most of the iconic moments the films are known for first appeared.