Anything that fits their eventual extended universe would be fine by me. A light-hearted racing game, a shooter of sorts (probably more DK64 shooting than with actual guns), as long as it fits and they're open and honest about it, it's fine. Their only mistake in my mind would be the Nuts 'N' Bolts route - promising one thing and delivering another, which they've set as one of their four Rules they must abide by. I'd like to see a core base of 3D Platformer Collectathons, with side-games of almost every genre, as long as they're happy making it then the fun will shine through.
Came to save my sister, stayed for the quiz show.