I...don't really think this one is all that good?
I'm going to jump straight into something that I forgot to talk about last week: the Ninth Doctor himself. I've been trying to put my finger on what sets him apart from the others, and...for me, it's his goofy aloofness. He's at once extremely enthusiastic and slightly contemptuous of those around him, with an edge that definitely doesn't carry forward to his successors. He certainly throws Rose into the deep end in this episode, dropping her far into the future, well after everyone she knows is dead and gone, just in time to (almost) watch her planet get destroyed by the sun.
There are really nice character bits throughout, like Raffalo the plumber and of course Jabe the tree lady. Lady Cassandra certainly is memorable.
The Doctor lets Cassandra dry out until she explodes in the end. Remember kids, the Doctor never does cruel things, and the more recent seasons have ruined everything!
Not the worst episode ever, but hardly the best. It continues to focus on Rose's journey, and her reaction to exactly what it means to travel through time and space. It also continues to lay out the Doctor's backstory in small drips.
Edit: Oh, and it's sort of weird that they didn't tie the Adherents of the Repeated Meme more directly into the Bad Wolf nonsense.