I would say that as an android user, poly does not quite 100% rock now. Its getting there, but the lack of the gofigure app still kinda sucks and makes certain things a bit more difficult. DLNA is a good option since its quite easy to use, but as far as I can tell, it doesn't support gapless playback. MPD should support gapless playback from my understanding, but without the gofigure app, you are going to need to carry the pin around to get the IP address in order to use it (since we dont have a glider alternative that does the hybrid dlna/mpd). Additionally, if I understand correctly, MPD still doesnt actually index mp3 files, meaning you have to use the folder view, which isnt really preferred. And, without a direct airplay alternative yet, there is still no great or easy way to stream audio (like spotify). Bluetooth works, but audio quality is reduced quite a bit, and at least until they fix it, there is that skipping from the network constantly trying to connect, even when using bluetooth (assuming you arent connected to wifi).
So, its getting there, but I just dont think its there yet, especially not as an android user. I am not trying to be negative for the sake of being negative, but there are still genuine use cases that just either dont work properly, dont exist yet, or as an android user, are less than optimal.