You'll probably get more and more detailed responses at a site like Flyertalk, since those guys and gals are road (flight?) warriors they know everything there is to know about seats and planes.
I was so glad I used seatguru before a recent flight on United in business class, since I would not have even considered that some seats faced backwards! Staring at either a wall or the rest of the plane would have made for a very odd trip. And in fact, some of the seats immediately faced other seats, which is even odder.
It's just a matter of trying to squeeze as many seats as possible onto the plane, I get that, but cmon.