Been playing for the last two weeks. It's fun and frustrating at the same time. The only non-standard weapon I have is the first VS bolt sniper rifle - everything else I use is the standard issue gun. And it sucks. I can empty damn near an entire clip as a HI, ENG, or Medic, into someone, they'll turn around and have me dead in .5 sec with 2-3 bullets. Bleh. I also lag out like a mofo in the 48+/48+ fights to the point I really shouldn't even bother with 'em, yet Instant Action always sends you to those. Lately just been going ENG in those, dropping ammo and repairing MAXes for exp.
I'm actually preferring the lattice system myself, other than it makes too many large fights where I can't do much in.