I don't feel comfortable commenting on something until I tried it,
http://i.imgur.com/xD7qKIt.png after completing all the pvp pursuits I'm feeling pretty well at home with what I'm about to say. PvP here is pretty much on par with pvp in TF2, there you have medics using kritz guns on demoman using sticky nades to kill everyone all the time forever. In here, you have players using Siphon weapons, fastest firing weapons possible, along with certain perks to accelerate it. Or they're using infectors. And in some cases, they use both with the siphon weapon for close range and the infector for the longest range in the game. My suggestions to try to balance out pvp, in no order:
1) Disable infectors and siphon proc in pvp, this is extreme but would solve the short term problem. Thing is then people will latch onto explosive weapons, which is already happening now to combat the siphon and infector usage.
2) Re-work perks, a lot of them can be merged to make room for new perks that can do things like reduce damage from infector bugs, reduce damage from fire, etc stuff like that.
3) Give people random pvp layouts, both perks and weapons. So you don't actually bring in your own weapons and perks, you get assigned a random set along with everyone else.
4) Seperate out players in EGO brackers. 1-1999 players in their own bracket, 2000-3999 in another, and 4000-5000 in the last one. Having so many perks gives a very huge advantage over newer, or slower leveling, players. This problem is also further accelerated by the perks a player gains when they max out a gun. A minor 0.## % boost here and there doesn't mean much, but once you get high enough with a weapon skill, it adds up to a lot.
And that's pretty much it. PvP is in terrible shape, but I guess no different than the situation in TF2 or even back in the day on BF2142 with RDX spam or medics with rockets. But! I do have some advice, if you are getting tired of people using infectors and siphon weapons constantly, then yes do use explosive weapons. You'll still die a lot, or maybe you'll make more kills, but it'll piss off these people a lot. A lot.
http://i.imgur.com/u7NNwvw.png The reason /r didn't work is because this person logged off right away.
I was using a Bonfire from cloak, if you want to inspect me, feel free, I'm pretty sure I logged out in my pvp slot so you can see what I done. Yes those are two bonfires I have equiped. Some times I can fire off two rockets by switching weapons, most of the time firing one will cause both needing to be reloaded. I find it's worth it to keep both going still. The trick works for courier sawed-offs as well.