Something I like about the intro is that it shows the good and bad of both sides, especially if you play it with both Hadvar and Ralof.
You'll get a bad impression of the Imperials at first, with the near (illegal) execution and seeing a torture chamber (that Hadvar regrets existing). On the other hand, Hadvar tries to speak with the first group of Stormcloaks that attack, but they'll have none of it.
The Stormcloaks seem sympathetic at first (and I admit that I like Ulfric's "Legends don't burn down villages" line), but Ralof doesn't bother with negotiation. He just tells you to get ready to fight and prepares an ambush.
And while Ralof decries the Imperials for having a torture chamber, you can find later on that Ulfric has his own in Windhelm.