An excellent episode with enough colour for the sci-fi eye and enough danger that makes you really wonder if everything will work out in the end.
Come one alien, come all. The makeup and special effects department worked extra hard to give the audience a true feeling of what to expect in the Who-verse. This isn't the glue on ears and foreheads from Star-Trek, nor soulless tyrants with advanced technology; it is a menagerie of colour and shape. The Face of Boe, my personal favourite, is beautiful in its simplicity and as a feature later in the series, keep watch for his cameos.
Rose wonders whether she has gotten herself in over her head getting into trouble with a complete stranger. While complete destruction is nothing new; and the magical "save" button that happens to lie just beyond that dangerous crossing is nothing new either, the heart of the episode is a discovery of who the Doctor is himself. A wonderer who walks into a situation often ill-prepared, an intellectual smart enough to get out of trouble and as someone who will fight through danger to save innocent lives even if they have just met.
Welcome to Doctor Who. If you don't like aliens, charismatic leaders, some technical tinkering and cosmic justice handed out by a self appointed judge then say out of the TARDIS.