Shmups are the best genre of all time.

--------------------------------------------------------------------------------1. There's no attempt at trying to write a story they can't possibly truly aspire towards, not being writers and everything.
2. Great music.
3. You get to blow up tons of shit.
4. The idea of high scores is fun, because it's a tangible expression of "Hey, I'm better at this game than you are."

For you maybe.

I played some, not bad...but the homebrew ones are INSANE!