I ran for myself a meta-analysis of Paizo's customers comments. It strangely agrees with my own perspective, so I give you the ranking as well as my comments. The higher the number, the better.
9./10. Rise of the Rune Lords. Agree, awsome stuff. Didn't need too much tinkering to suit my needs.
9./10. Curse of the Crimson Throne. Agree, awsome stuff, even if I dislike episodes 4-5. To me, the campaign should have been shorter, 4 episodes would have been sufficient. As a player, I guessed since tome 2 who was the super-villain. Unfortunately, we had to wait to reach the appropriate level to confront it.
8./10. Skull and Shackles
8./10. Reign of Winter. Probably made this rank due to episode 5.
6./10. Kingmaker. I was surprised it didn't ranked higher as it is one of the most discussed campaign on the forums.
5./10. Second Darkness. Underrated IMHO. I find the arc of episodes 3 to 6 awsome, with the exception of the 5th episode, really bland - but easy to shortcut.
4./10. Wrath of the Righteous.
4./10. Shattered star
4./10. Council of Thieves. Episode 2 is awsome though.
4./10. Carrion Crown
3./10. Legacy of Fire. Agree, it is rather weak as a campaign, except the great episode 4.
3./10. Serpent's skull
1./10. Jade Regent