Skate 2 added a lot of tricks which in the original you wondered why they weren't there. Things like vert handplants, and hippie jumps. It added some new flip tricks, but mostly the most surprising thing they added was one foot airs, no complys, boneless, and one foot grabs.
After skating around for the first few minutes, and getting to know all that, you feel the tricks are dry, old, and worn out. I discovered this last 'new trick' somewhat late in my play, and it sparked a little fire of interested that quickly died out again because of the physics of the trick. If you are holding a one footed grab as you approach the ground, if you have a slow enough downwards velocity (usually at the peak of your jump) you can kick off the ground for just a little more lift.
Its fun for a little while when you do it correctly, but as I performed it more and more it started to get on my nerves. The velocity they actually let you use this trick at is somewhat generous, because the skaters ankle never cracks under your weight, even though 9 times out of 10 it looks like it should.
Then soon after that, I felt that this was just skate again, and it was business as usual.