There's something very special about the first episode of Doctor Who with a new companion. All of the excitement and promise with something of an edge, too, of the past but so soft that it can't hurt us viewers--not yet. It's amazing to be dropped into a new portion of the planet and this new person's life and friends, family, neighbors, coworkers, etc. To see their lives and feel the surge of excitement as they catch on to the world opening up around them with the Doctor's arrival. That first adventure is always the best because you know it's leading to something grand but you don't know what that grand thing will be quite yet.
I think I shall quite like this season of Who. It is fresh but not forgetful.