Yeah I guess that's true. Though even some Spiderman fans complained about yet another version of the origin story being put on film. I mean move on already! Lol
There's an unwritten rule that every superhero movie franchise has to start with the origin. That's
kinda why Green Lantern was a busy movie. That huge, humongous info dump AND the required mucking about with newly discovered super powers. Batman, in every movie incarnation, was lucky enough to drop us right in the middle of the action, and showing/mentioning his parents getting shot in flashback.
But I'll take seeing the same Spidey origin story over the what could have been... and I shudder at the thought of Spider-Man 4: the Quest for Piece.
AS for the turtles, we
always saw their origin, mostly in flashback form (as it was told in flashback form to begin with), and the story always has something consistently similar (though the new comic series is the most drastic of changes, but it's still got the weirder threads in common). And we've seen it in the comic, first cartoon series, first and second movie, live action series (I swear it was, I try to block that one out), mentioned in the crappy musical stage show (in the one
good song), second cartoon series, mentioned in passing in the 2k7 movie, the IDW comic (which was a different origin completely), and you know it's going to be in the new series. They kind of have to retell the origins for those just getting in. It's tedious for those who have seen it before, though... but that can't be helped.
And I really don't think Raph's going to blow his top and meet Casey Jones in this one... but they had BETTER introduce Casey down the line.