Start with the one about the whales.
Serious answer: Start with 4, 5, 6. The prequels would ruin a bunch of stuff about the originals (see:
this article.) Of course, you could turn that around, and say the originals would ruin a bunch of stuff about the prequels (imagine watching the prequels without having any idea what Anakin's going to turn into.) But...well...you can't ruin something that already sucks.
Dude, Haydyn Christensen is a competent Actor. Life as a House, Shattered Glass, good work from him. It's just that even if he wanted to, he couldn't do much with the role because Lucas wanted the role played that way.
Yeah, I wish people would stop saying Hayden Christiansen and Jake Lloyd are bad actors. Giving a good performance in a Lucas movie is nearly impossible. Just because extraordinarily talented people like Samuel L Jackson managed it doesn't mean others are bad because they didn't. Think about what the actors had to deal with:
1) Lots of green screen. It's hard to give a good performance when there's not much to play off of.
2) Lucas' horrendous dialogue.
You try saying "I don't like sand. It's coarse and rough, unlike you." without sounding ridiculous.
3) Lucas' horrible direction. The guy just has no idea how to work with actors. In a behind-the-scenes documentary, I watched Lucas direct Christensen. "No, no," said Lucas. "Say the line more forcefully." And then Lucas gave an awful, over-the-top reading: "'I WILL NOT betray the republic.' Say it like that. I WILL NOT betray the republic." (He repeated the line a couple more times.) Gah. One of the cardinal rules of directing is never to demonstrate how you want an actor to say a line by saying it yourself.
4) Lucas' terrible taste. Let's say you're an actor in a Lucas movie, and, in spite of all the things conspiring to make you give a terrible performance, you manage to play a scene well 9 out of 10 times. Even then, you might be out of luck. Because Lucas doesn't know what good acting looks like, he might decide to put the one take where you gave a bad performance into the film.
So yeah. Don't assume someone is a bad actor just because he/she couldn't give a good performance in a Lucas film.