I've been watching them in 1-2-3-4-5-6 order, and noticed an interesting effect of this order is that, except for the last one, they just keep getting better. 2 is better than 1; 3 is better than 2; 4 is better than 3; and 5 is better than 4. (I realize that opinions are mixed on 2 versus 1, but it's close, and the general pattern holds.)

Some people in this discussion (including myself) have expressed a desire to maintain the surprise of "I am your Father" in Episode 5. Watching them in order, I have decided that it's not a great loss. We know that Luke doesn't know, so the emotional power of the scene is still there. The surprise is gone, but TESB is such an excellent movie that it doesn't need to rely on a surprise twist ending for its impact. Even without that surprise, it still stands as the best episode of the series.