Love extinction mode, you didn't give it a proper chance.
I played Second Son for 4 hours before getting on Extinction with a mate. Acquired Neon power, hated it, got used to it, loved it, suddenly got smoke power back for the boss battle.....and couldn't remember for the life of me how it worked!?!? The neon replacement for the Orbital drop (can't remember what they call it) is the dogs danglies eh?
Can't understand how people can play it through so quickly. I think you know whereabouts I am mate and that has taken me over seven hours. I cleaned out three districts to 0% first mind, before deciding to do a couple of missions. Hunting down the hidden cameras and stuff is great as it shows you all the districts you might never have wandered across.
A fantastic game if my opinion counts for anything old man.