I find it funny that nowadays Sonic has gain some notoriety yet Mario is always seen as the "be all and end all" of platformers. Ever since Sonic 06, every new Sonic game is always being bashed. Yet the new Mario games are always seen as perfect. And no, It's not because of the stupid "professionals reviewers are being paid to say this" excuse.
The last thing I want to do is turn the Mario fanbase into a bunch of nethanderals, like the Sonic fanbase, but I have to say it: We say Call of Duty is the same thing every year, I fear the same could be applied to a few Mario games as well.
First off, the main series games always have the same plot: "Bowser kidnaps Peach and Mario goes to rescue her". The only exceptions would be the american version of Super Mario Bros. 2 (though, on the surface, that was just a reskin of another game) and Super Mario Sunshine. I'd love to see some more spin-offs being released, not just with Luigi and Peach, but with some of the other characters in the franchise.
Here's an idea for Super Mario Land 5 (counting 3D land as number 4): Tatanga returns for revenge and it's up to Luigi and Daisy to save the day. Stupid, maybe, but it's a lot more fresh than "Mario, help me!"
Secondly, not every Mario game, main series or spin-off, is perfect. The original SMB2 really was "the lost levels" from the first SMB. It's the same game only with a few more features (sound familiar?) and harder gameplay. Same story for Super Mario Galaxy 2; on the surface, it looks just like the first Galaxy (maybe because it started out as some kind of expansion pack?).
And I really need to address New Super Mario Bros. and New Super Mario Bros. Wii. Play the first world in both games and tell me with a straight face that, aside from co-op and the removal/addition of items, it's not the same game. The original Super Mario Bros. trilogy (or Quadtrilogy, if you count Super Mario World which was released in Japan with the subtitle "Super Mario Bros. 4") always had something major to separate them from previous instalments. Then again, Wii was pretty much a follow-up to the first NSMB. So then what about New 2 and New U, which were announced back-to-back? How are those games gonna be different from the first two? I understand that New 2 was gonna have more of a focus on collecting coins but what about New U, how will that game be different?
Just something I wanted to throw out there.