I would say a 2 or 3 at best too.
Some things weren't super clear to me after the tutorial...but 5 games in everything was natural, beat easily the easy AI and now moved to the normal one (which trounces me).
It's way easier at first to play military worlds imho.
Everything has clear tootips but I've noticed that after a while I can discern and understand the general meaning of icons and position at a glance.
At first I found super handy the fact you can zoom in a card and then swiping you move to the next/previous one to read and decide what to keep/what to deploy (this should be standard behavior on ALL card games on iOS but sadly it isn't).
The real life game must be a real nightmare tough.