It's the reason I cannot understand those who hate on these movies. Yes, they are cheesey. Yes, the plots are simple. But they have a sincerity and a realness (in spite of being a fantasy) to them that I haven't found elsewhere in the genre outside of Christopher Nolan's movies. Nobody's movies have the emotional undercurrent and heart that Raimi's did. Most don't even attempt to. I loved The Avengers, but there wasn't even the slightest attempt to mine any kind of emotional journey for the characters or audience. Spidey 2 works so well because most young adults can empathize with the world constantly shitting on you, and how good it feels when something finally does go your way, and EVERYONE can sympathize with the themes of sacrifice for the greater good.
Raimi, I salute you!