Nintendo seems to get a raw deal for making sequels that have no drastic changes. That was one of the biggest complaints of Smash, NSMB Wii, and will probably the same for Galaxy 2. Yet how big are the changes in sequels for major franchices for sequels such as Call of Duty, Uncharted, Halo, Bioshock, God of War etc.? You rarely hear people complain, whether critics or gamers, it is more of the same.
In my view Nintendo is reknown to make innovative gameplay changes to their franchises that people expect to find it in all their sequels. Which is unfair to Nintendo unless you hold the same standard to the sequels of other franchises.