The first time we see the Daleks in Nu Who, and for new comers who aren't familiar with this particular enemy we get introduced to them at the best. This is a great episode were you truly feel you have entered the Who-verse. Needless to say if the Doctor is terrified of these guys then I think we can assume they are bad news.
They do a good job of making you want to empathize with the damaged Dalek. It has been tortured, bruised and even the Doctor looks down with disdain upon it. Yet, this episode really shows the danger the Daleks pose. It is good to see the Dalek use some creativity in its destruction demonstrating the intelligence of this enemy. It is also nice to see that stairs will not be a problem.
Again we see that Christopher Eccleston's Doctor has a little darker side with the comment "you would make a good Dalek" striking a cord.