I wouldn't go criticising the themes just yet given we know so little about the game so far. Besides, there have been some really good levels with new ideas based around some of those themes in recent games. The Lava rollercoaster level in New SMB Wii for example was more exciting than most of the levels in Galaxy and the Ice levels introduced the Penguin suit which made for some interesting gameplay. Even in the original New SMB there were those bouncing on mushroom levels which were something I'd never seen before in a Mario Game.
If you ask me what New SMB 2 needs is a space themed level. Actually I don't care if it's not a new idea or if it's lava themed or ice themed or whatever, give me some more Mario Galaxy gravity fun in 2D!
Some good Aussie musics: King Gizzard, Pond, The Avalanches
"Don't stir the pot" is a nice way of saying "they're too dumb to reason with"