Re: Sacrifice of Angels , Ex Deus Machina?
Well we had seen the wormhole aliens affect in passage of ships through the wormhole before, so it wasn't as if they suddenly introduced some new ability. The wormhole aliens had also been in the show since the pilot so it wasn't as if they indroduced something new. So no I don't think it was a Deus Ex Machina.
You could perhaps argue it was a contrived ending but that isn't the same thing as a Dues Ex Machina.
On the continent of wild endeavour in the mountains of solace and solitude there stood the citadel of the time lords, the oldest and most mighty race in the universe looking down on the galaxies below sworn never to interfere only to watch.