Oh boy, as soon as he said worst of the six I just knew the flames were gonna start.
Return of the Jedi is actually my second least favorite, but it does have some great moments that keep it from completely sucking.
My order:
1. A New Hope
2. Empire Strikes Back
3. Revenge of the Sith
4. Attack of the Clones
5. Return of the Jedi
6. The Phantom Menace