if you hold the left stick on one direction before you pop the ollie you barely do a 180, but if you ollie and hit it as your leaving the ground 360's are nothing.
I think the game is a big improvement over the first except their arent as many random spots to skate. The first one was cool because you could find small skatable rails that you would never notice if you didn't look. "The Rez" was a lot better in it.
Oh and 360 flip noseblunts seem to be impossible on curbs in the 2nd one, kinda random but wierd