Although I do find Sofia horribly distracting (especially the Snarl Face mentioned earlier), there are many scenes that I love.

The "I dread you" scene is magnificent.
Almost any scene with Talia Shire.
Kay and Michael in Sicily.
The opera.
Michael's confession.
Michael kneeling at Don Tommasino's coffin. "Why were you so loved?".
Mary's death scene.