I didn't watch the show much either, but these promos were all over ABC for a while. Snow Patrol's "Chasing Cars" was another one I couldn't stand for a while because of that show.

Obi-Wan was never exactly saintly to me - a man who even after his death is still willingly keeping a boy in the dark about his heritage to groom him to kill his father doesn't fit that to me - so I guess it wasn't as hard for me to become disillusioned with him. ;) (That, and I found him way whinier/arrogant in TPM than Anakin ever was in AotC.)