Yeah, people are getting pretty deep into the lore of this thing. I kinda felt like part of the point of the game is to just let it be what it is. I watched some of the bits on youtube that I didn't get because I didn't go for the bad ending.
Martha was excellent. I feel like she kind of got shafted though. Poorly utilized, with a "me-too" love-the-Doctor arc coming right after Rose. Moffat is a better writer of individual stories than a show runner, IMO. Blink, The Silence in the Library, and The Girl in the Fireplace are among my favorite of the revival stories. But his output as a show runner has been... Scattershot.