This episode introduces Martha Jones, who right out of the gate seems a lot more competent than Rose did. Her hospital gets teleported to the moon and she and The Doctor have to escape essentially a police search by the Judoon

This episode does a really good job setting up Martha as someone who does well in chaotic situations. She tries to keep the peace between the different sides of her family and she does a lot to help the situation in the hospital

The Doctor is clearly not over what happened to Rose, but he seems to be trying to have fun and move on

The Plasmavore was a decent villain, even if the straw was a bit goofy. The more interesting aliens were the Judoon though. They seem to have a very strange limit on what they will do or interfere with, like they can teleport the hospital to the moon and back to capture their target, but when that target tries to fry half the earth (somehow), that’s outside their jurisdiction?