So on one hand it seems totally unlikely that a ragtag rebellion--often led by a kid, a walking carpet, two gamblers, two droids, and a princess--would have any chance of defeating a galactic empire. On the other hand, the empire is extraordinarily stupid, and the rebels have dramatic irony on their side. So... there you have it.
I remember watching the Return of the Jedi when I was ten and thinking to myself, "The Star Destroyer just crashed into the Death Star. SWEET IRONY!" And then when watching the prequels, I thought to myself, "So the rebellion was initially created in order to increase the Palpatine's power, but it's also what ultimately led to his downfall. JARJAR SUCKS!"
Yeah. And that's about all I've got to say about that.