Bada sucks... seriously. Their API is completely home-made, complete with nested C++ namespaces, just like those idiots at Nintendo.

So you basically have to rewrite a big bunch of your app from scratch, no easy porting.

I wonder who wants to write/port any app for that stupid platform anyway. And the OS is a stable as a pile of sand. You can make the whole phone crash just like that. When it gets low on resources, it offers to close all apps, which includes the main menu! So after that, you might as well reboot the phone. Silly.