It's going to be a F2P game. F2P games will always have restrictions and features intended to entice players into making use of microtransactions.
The whole concept of the airdrop is to give you a head start/boost to your survivability, thus the non-paying customer will not be restricted to content. If any, the non-paying customer will get a better experience at the core of the game: hunting for loot and trying to survive with the bare minimum.
I believe that most of the outrage over the past few days have been as a result of the community misunderstanding (like Zuma, taken out of context) the devs w.r.t. "buying weapons". If a weapon is freely available in the open world and happens to pop up in a paid for airdrop, does it equate to premium content?
I borrowed a friends account and played 6 hours this weekend. Saw a couple of airdrops happen and the chaos that ensues - random players rushing it and zombies following them.
From my own experience, raiding 3 crates did not yield any uber advantage; instead I found some ammo (.308), basic gear (helmet) and crafting material (batteries, food, bandages, wood, lighter, steel). Sure it gives you a leg up, but if you go grind, you'll find exactly the same. So the airdrop, as it stands, is basically a paid-for spawn "hack" that might not yield much value.
I'm still in two minds about the airdrop mechanic; it breaks the survivor style game play by getting loot almost instantaneously, but with hungry zombies, and hungrier players around, there is an element of tactics/strategy that'll be required in future. Just imagine seeing an incoming airdrop, a bunch of players running towards it (hunger games style?) and a lone sniper chilling on a hilltop, picking them off one by one, whilst his/her comrades mop up and loot as they close in on the airdrop. What about players looking for Carmageddon style carnage?
As for the game, as it stands, I won't be buying an Early Access title anytime soon. After spending plenty of time on DayZ and getting plenty annoyed at the snail pace development and almost game breaking bugs, I don't want to invest effort in another alpha release.