Well, if they made a new one, I'd like to see it go quite a bit more in depth than the old cartoons. While the old ones had some clever music that I love, and made a good attempt at not going off the wall, the weird worlds and human characters kinda... just made it weird. I didn't like the bland scenery and how they splashed the environment in... a computer animated cartoon would be pretty awesome... as long as they didn't make it look like Mario Party 4 through 6. I can't stand their solid blank colors of their clothes, etc. I'd LOVE if they made all Mario games look as good Brawl. There, Mario has detail in everything from the stitching on his hat, to the seams and logo on his overalls. I'd be mad if they just threw the little one-seam-down-the-pantleg thing and put a light blue hue for his overalls. If they made it, I'd want landscape, a horizon, clouds, and blocks floating everywhere, and actually have a Mario-esque plot rather than helping random humanoid folks out. Well, also, I'd want to focus on speech and make some down-to-earth dialogue rather than cheesy exclamations that totally relied on alliteration (although some were creative). Oh, and I kind of hate it when characters move their heads up and down when they speak such as old Scooby Doo episodes. I guess they're just trying to let kids know who's talking, but it still bothers me.
They'd have to make up some creative music and finally fix Mario's current color scheme, hopefully voice, and that they made him a food fetished fat dude with an incorrect mustache. Food fetished fat dude.... the alliteration phrases from my SMB:SS DVD's are getting to me!!!!!!!!!!