I thought the controls were pretty good in 2 with nothing especially obvious that could be done to improve it, hall of meat controls are a bit better mind you. I might go so far as to say I liked the level in Skate 2 more but that is not to say 3 is bad by any means.
Also, as mentioned, the local multiplayer was nerfed until DLC (they did a whole online thing though which I am told was good) which is classic EA but there is nothing stopping you setting a checkpoint and throwing the controller over. The DLC itself.... the Hawaiian pack is pretty good and San Van party pack is the one that restored local play but the others are nothing much.
Overall I am not going to say go with skate 2 if you are coming in cold and I can see how some (a very small number at that) coming from 2 would feel slightly less than stellar about it when it was brand new but Amazon has it down as 17 USD brand new and you can improve on that loads when going second hand. That or Borderlands next week it is Borderlands but if you are passing on that for now then definitely Skate 3.