They have some good games that are free instead of pay, and then there's stuff like Transit (which I do use a lot; for public transportation timetables), City Lens (which is an augmented reality gimmick app), Music (which is like spotify, and I may look at since they are not rolling Spotify out any time soon for wp8, and XBox music sucks), and some other stuff. Like I said, I don't think they are important enough to warrant clinging to Nokia for any reason. Drive was their best exclusive app, but since it is now for everyone ... it is no longer a factor.
The HTC Windows Phone 8s/8x use Nokia Maps. This is an offline map, with POI and directions. On my HTC One V, it has Locations app, that is based on the same Nokia map technology, and it has Car app which is based on Route 66 that uses Nokia Maps.
So yes, Nokia Maps is everywhere,and I love it. Nokia is the reason I can't dispose my Nokia E72.
My phone and Surface refuse to pair. They connect for a couple of seconds and then unconnect themselves because they think they are both offline. I have no problems connecting my Surface via Bluetooth to a wireless speaker.
According to my opinion from three mobiles discussed by you Nokia Lumia 810 is best. I am using Nokia Lumia 920 and I really in love with this phone. As you clarify that you could not provide Nokia Lumia 920 so Lumia 810 is best choice instead HTC 8X and Nexus 4 (4.2 Android).