If you just get membership, you'll have enough certs and SC to have fun with it. My friend who is grinding it out says it's annoying if you want to do infi and vehicles, but is manageable if you specialize. Now that you can use everything for free in VR training and find out what you want, that's much less shitty of a proposition.
@jozzy: Did you ever throw a grenade in Planetside? Use a lasher? I don't agree with Jeff's sentiment that shooting was fine in the old one, and no one is being egregious saying there's a lot of ground to make up. PS2 hasn't fully resonated with everybody yet. Would you rather he make a blanket statement about a game he hasn't played?