Play DVDs on an android device (preferably Google TV) AS DVDs (no conversions, please)
As far as I know there is no DVD-player software for Android. Nothing that can emulate a DVD experience from a network (or even local) location.

What are you needing from a full DVD experience that you cannot get by transcoding the movie to a portable format? Scene selection? That's really just a way to visually access chapters in the movie. I've used HandBrake to transcode my movies for my Droid X2 while keeping the chapter markers.

If you need things like different languages and subtitles, HandBrake can include those as well into your MP4/M4V output.