I enjoyed it. It's not perfect but... Could you make a better FPS? I know I couldn't. Customization of weapons might be cool. The card system is... Odd but seemingly effective. The one thing I do really like is the style by which you acquire the upgrade cards. As a veteran of the Battlefield franchise (as far back as 1942) it pains me that the latest games make you go though the motions of getting upgrades you'll never use. The idea of getting points that you can use to unlock upgrades that fit your play style is right up my alley. I still haven't managed to grab a fighter power up and I've maxed out lvling up so its gotta happen some time.
One thing I'm not a fan of is the randomness power ups. It reminds me of the way you get power ups in Halo 4 which I didn't like either. I'd rather be able to select either Smart Rocket, Orbital Strike or Imploder as my power up. That's my only qualm but this is a beta. My buddy and I got a good roll out of it tonight and we were both generally happy with what we saw.
That one-shot projectile weapon that looks like a Hunting Rifle from Fallout though eh? Daaaaayum.
It's not my job to make video games. It's not my hobby, it's not my passion.
Do you buy a car from a car salesman and then tell yourself, "Eh, he wasn't a very good car salesman, but could I do a better job of selling cars? I don't think so"? I suspect not.
Whether or not you can perform a task to a certain level - or not - is not relevant. What is relevant is the game at hand and how good it is - or isn't.