Anakin Skywalker's turn to the dark side was 'fast' in the eyes of many Star Wars fans. However, in 3 minutes I will explain to you how it is not fast at all, and why his turn makes so much sense. In fact, I would argue his turn was justified (not his actions, those were messed up, but his turn).
Order 66 aside, Anakin's years of being put down and held back by the Jedi was a test for him to overcome his impatience, however, when he couldn't save his mother, the process had really begun.
I believe, like Dave Filoni said, had Qui-Gon Jinn beat Darth Maul and trained Anakin, then Qui-Gon would have been the father figure Anakin always needed. Anakin wouldn't have turned. However, Obi-Wan as his master, was not fully ready for such a padawan.
Anakin's turn is a reflection of the treatment and abuse he received over the years at the Jedi Temple.
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