You sleep their healer, they sleep your healer.
Your drg and tank chase their blm, their drg and tank chase your blm.
Your blm runs from their drg and tank, their blm run from yours.

In most cases, PVP in mmo doesn't make sense. In WoW, in AION, The pvp is ingrained into the story. The rest of the MMO however is... Well, they're like single-player games, that you can invite your friends for 4/5-man-coop in dungeons. You're the chosen one, you're the one true hero, bla bla bla. And you see 10 000 concurrent chosen ones running around, and the PVP is just something they added.

That's probably why I played AION for the longest time, PVP WAS the story.

That's why it doesn't make sense. In WoW, it's Alliance VS Horde. In Aion, Elyos VS Asmodian. You start the game and pretty much have "Kill those other side" stamped on your mission log. Not sure about WoW, but in Aion back then, you get points for pvp and pve and redeem awesome gears. Great for pvp, and for pve.

Now compare it to most mmo pvp nowadays. We're all on the same sides, the GCs are pretty much on the same sides as well, faced with the ever-awakening primals and mysterious enemies that seek to do who-knows-what. Aaaaaand they just go "Let's kill each other for sport =D" Sure, maybe there's some intricate story about how Raubahn hit on Kan-e-senna and Merlwyb got jealous and start a private war and solicited adventurers to mess up Kan-e's forces as revenge for flirting with Raubahn. But come on. The imperials, the primals, the beastmen, the Ascians, they're kinda.. I don't know... demand more attention? And then the rewards. Only useful in pvp. When games segregate pvp and pve that much, makes it feel like either pve or pvp side is just a side attraction, they're not related. I know it's not fair for pve players to commit to pvp to obtain something and vice versa, but there are better ways to achieve harmony instead of just turning one thing into a side attraction. I went for ages in Aion without touching PVP, and I'm never gimped against rank 1 soldier.

The only way I can see how the Frontlines patch are going to fix this is if it's totally up to the adventurers, as they are free agents. Battle for territory is a good motivation and not really messing up the story of how the grand companies finally managed to play nice and work together.