Tied for 1st is Waterproofing and breathability. I doubt I will ever go any lower then 20k on either. Ill likely stay with goretex or equal type fabric.
2nd: functional pockets/waterproof zippers
3nd: Doesnt have the "im a snowboarder so I have to have my clothing 5x bigger then my size" look.
4th proper venting.
Fact is I wont by a jacket without any of these features so they are all tied for first.