He didn't have this kind of dreams, premonitions for the first time. He had them (with his mother) before doing anything bad/evil/wrong (like killing the sand people that killed his mother).

The Jedi's minds were clouded by the dark side. They could not see that the Sith Lord was amoung them for such a long time. I think they were overwhelmed. They had their limits.

At the end of ROTS I finally understood the "death" of Obi-Wan and Yoda from the "original" movies. I always wondered why Obi-Wan and Yoda's bodies had disapeard while Darth Vader's, a Jedi also, didn't. He just died and his body was burnt. It was because he failed to find the very think he was up to when he fell to the dark side: immortality, the way to cheat death to save Padme. And Yoda and Obi-Wan found it with the help of Qui-Gon. I always though he was a great Jedi, though not a member of the council. He found what no other Jedi did...

I also think that the Jedi treated Anakin with much disrespect. How could they accept him in the council and not make him a master?

And what's the most important idea in the whole saga? That sometimes, to destroy evil you must become evil. And that's why the Jedi failed to understand that Anakin was indeed the one the prophecies told about. But first he had to become a Sith in order to destroy the Sith.