That is very much true. I thought Episode 1 and 2 might have more events that would tie into the original trilogy but they just seemed to bring in more mysteries than answers. Episode 3 has a lot to cover to better link them to the older films. So I think I finally understand that it would NOT make such a good stand alone film.
I would have thought it better that the series started with the events from Epsiode II.
Obi-Wan finds Anakin at the age similar to Luke and they get caught up in the big Clone War. Anakin befriends Obi-Wan and Obi-Wan senses his potential. As they get caught in the fury, Anakin proves himself by helping to win the first battle and it ends on a high note. Obi-Wan is convinced Anakin should be a Jedi and recklessly TAKES IT UPON HIMSELF (and NOT through his dying Masters wishes) to train him.
Episode III's events would then fall into Episode II.
The Clone Wars have carried on, Anakin is older, wiser, stronger as we know. His relationship with Palpatine has grown and by the end of the movie, Anakin turns to the dark side, has a massive fight with Obi-Wan and the film ends with Anakin dying. Cliffhanger.
Episode III would then have the appearance of Darth Vader from VERY early in the movie and the plot would carry on, and would go a long way in keeping the series continuity, and could reduce the 20 year gap by a decade or so. I always thought it'd be cool if Obi-Wan knew about Darth Vader, but only ten years after Anakin died did he find out that Vader was in fact his apprentice, or something.
It's basically dumping Episode I's story. It was pointless. It re-wrote the story too. Obi-Wan wasn't amazed with how strong the force was with Anakin - he only trained him because Qui-Gonn asked. He didnt take it upon himself at all. They really did screw up Anakin and Obi-Wans relationship. It would have been more heart-rending to see a NATURAL friendship between Obi-Wan and Anakin, turn nasty. Sure they are friends, but Obi-Wan was reluctant to do anything with Anakin. Obi-Wan was supposed to be reckless and kind - having him form a friendship with Anakin and train him out of free will would have been better for cahracter development, and at least keep in line with what Obi-Wan says in ROTJ.