ONM reviews Super mario galaxy 2.

[MaxwellGT2000]

Nintendogamer said:

MaxwellGT2000 said:
Another great score, was kinda expecting the "lack of impact" type comments though, so no surprises, honestly I'd be more surprised if they didn't bring up that its not really innovating on the original.

pretty much innovates on the original, about 90% of SMG2 is newer compared to first one, new levels, power-ups, characters ect.

That's not innovation... new content isn't innovation at all.  See new ideas done a way that has never been thought of before to deliver a new type of product or turn an old product on its ear is innovation. 

But there is nothing wrong with not innovating as long as you don't stagnate yourself, but the industry kinda learned their lesson with that during the NES Era and at least tried to do new and different things every sequel by the SNES era, which isn't innvation but keeps a product from becoming boring (AKA stagnent)