Personally, I liked the movie better.
The main plot was a bit meh. All the interesting stuff happened in the interstices:
* Damn, but those boys look good in suits.
* I'm getting quite fond of Ruby. She reminds me a bit of a cross between Veronica and Buffy and Jo. And I like the idea of a demon working for good or at least allied with the good guys. (See Crowley.)
* "What do I look like?" "What do *I* look like? Cheapskate."
* Dean asking the demon about what it's like down there.
* All right, the Yellow Eyed Demon finally gets a name.
* I haven't been too keen on the whole "we're at war now" mantra, but the way they conceptualised it this episode - a war without a front, with thousands of demons jostling for power, when Sam should have been their general - made me go "Ooh, I get it now."
* Bobby to the rescue! (Again.)
* Dean asking Bobby if he thinks Sam came back different.