Watching the animated Clone Wars series makes the gap between 2 and 3 more palatable. You see Anakin grow in the force, but also see the darkness simmering. It also shows the cracks in the Jedi order and lays the groundwork for doubt in their unimpeachable wisdom.

Like, if you just watch the movies, Yoda is basically Muppet Jesus. Anakin seems like a petulant child refusing to eat his vegetables and jumps right to murdering children. If you watch the series, it colors in all the shades of gray.