Oh my! It's not DLC... Seriously. It's a game, not downloadable content for AC:R. Honestly, it's like 9$ or less at GameStop, so if you really want it, go get it.
I already got AC, AC2, and AC:B on Xbox. I got'em last December. I enjoyed them and still do. I don't see what you're getting all huffy about, think about this... AC doesn't have Trophies for PS3, only Achievements for Xbox 360.