Earlier quoted context omitted.
With respect to only having to "worry about one resolution", I disagree. Android does give you a set of tools for working with multiple screen types, but it's a bit more complicated than "2 sets of art assets". This only addresses one aspect of different screens: pixel density. This still leaves out different screen sizes. Even then, a "normal hdpi" screen can still be different from another "normal hdpi" screen. It…
There might be slight differences between "normal hdpi" screens but those differences won't affect a good design and the developer won't have to worry about it. And it definitely has nothing to do with why the meebo app looks like crap. It looks like crap because meebo didn't put the effort into it.
http://developer.android.com/resources/dashboard/screens.htm...