Nailing down the which class works best in which situation is comes down to experience, and I still get the old death streak, or go up against some lvl 100 guy who just will not die!!! Might have something to do with playing US west, 200~ ping.
Right now I appear to be doing better in smaller scale fights, while the massive fights are great, I am still struggling to hold my own in these battles, might have to try getting into vehicles more, something I have just recently started doing, and put some certification points into. The ;larger fights are laggier, they give me a lower frame rate while recording, really has me shying away. I plan on getting an aftermarket cooler for my PC soon, so I can overclock CPU a bit, perhaps squeeze out some extra FPS. Hopefully the PS devs optimize the game a bit more as well, as there are still people on the forums moaning about performance issues when using beastly £1000+ PCs, Fingers crossed.