To everyone thinking that they won't play this because they think people that spent money will "PWNZ0R" them.
No, it doesn't work like that
This game is absolutely brilliant, I've been putting about 2-3 hours a week into it since about the beginning of March this year and I've unlocked 2 classes, a bunch of upgrades for said classes and a new weapon during my time.
The unlockable classes and weapons give you CHOICES, not POWER. There are a few essential upgrades you will need for your classes but these are extremely cheap and you will be able to afford them using the in-game xp (so no real money) after a couple of good rounds of play. Even then, things like the +50 health upgrade for most armours isn't really that big of a deal, when you consider that a good Spinfuser hit will do anything from 500-1000 damage depending on how good your aim is.
So, in closing:
1) Ignore morons that cry PAY2WIN LOLZ
2) It's free, so wth right?
I do agree about the update service though, that's stupid as hell