I'd say pretty well. Samsung is the top phone manufacturer whether you agree with their strategy of peppering the market with dozens of slightly different versions of the same two or three phones.
Top phone manufacturer? Yes. Best apps? Arguably - no.
Because of the various resolutions, Android is a hell to maintain from a developer point of view. That's why apps on Android usually look (&work) like crap compared to those on iPhone or WP7. Even top-tier apps, like Facebook, look & feel worse on Android.
