"Nintendo’s embrace of User Generated Content reveals a deep resentment for content within the company culture. They want to make gameplay ideas, not the content for them (they would rather dump that on you, the poor consumer). This distaste for content within Nintendo perhaps illustrates why Nintendo rarely adventures into new content. All we get is old content (Metroid, Mario, Zelda) recycled with new gameplay processes. Even with in the universes themselves, little is changed. Link still gets the Master Sword, hook shots, boomerangs, visits Kariko Village and Hyrule Lake, and defeat Ganon still after twenty years. The only difference is that the game is in 3d, or that you are traveling by boat, by train, or using the stylus, or you turn into a dog, or that you have no sword. For a company that champions creativity, Nintendo shows very little of it on the content side. This is perhaps why they keep hemorrhaging customers of the Core Market. People get bored playing the same content over and over again."
This paragraph is exactly how I feel. I realise now that this is what I want from new Nintendo games. Similar gameplay; new and original content. Pokémon is suffering from this even more than Zelda: there's always Gyms, a Rival, and Elite Four, an evil Team, legendaries fought at the end... - I don't want new gameplay modes from Pokémon (like Contests or Mystery Dungeon or Battle Tower). I want new content (new level design, music, game progression).
Same with Metroid. Prime and Fusion were interesting takes, but what would really interest me is the same sort of world and content expansion that Super Metroid did to Metroid, or SMB3 did to SMB1. Other M looks to be following Fusion in linearity, Halo in storytelling and FF in graphical style. None of those represent a world and enemies/items/puzzles expansion.