Re: mario galaxy 3 rip off of 1?
Mario Galaxy 2 is an embodiment of all the ideas they couldn't fit in Mario Galaxy 1, which apparently happens to be quite a lot of loveing things.
It's a sequel. Whether you consider that a rip-off or not, lol. You can't "rip off" your own franchise.
It's got a lot of stuff Mario Galaxy 1 doesn't have, like new power-ups, Yoshi, new playable characters, new worlds, etc.