Sequelitis - Castlevania 1 vs. Castlevania 2

Everyone knows Castlevania 2: Simon's Quest was a huge disappointment after Castlevania 1, but why?
In Sequelitis, I passionately discuss the relationships between video game sequels and their predecessors. I also crack a lot of jokes which may or may not be funny.
Getting a laugh or two out of a video is a-okay with me, but I hope along with it we can open up channels for more intelligent discussion on game making and how designers both young and old can learn from the greats and not-so-greats.