"Casting will always be interuppted [sic] upon receiving direct damage."

[Astarica]

Most likely, like in FFXI/other games, Provoke will actually force PvP targets to attack you for a short time. There are also things like Holmgang and various binds.

Sure, but these abilities only last a few seconds and then you get back to whoever you were killing before. I've played all kinds of PvP games before. I know there are games where taunt makes you have to target the tank for X seconds. That's fine. That doesn't stop you from immediately going back to whatever juicy target you're attacking the moment it wears off, so it's still a nonfactor. The only times I've seen where tanks get targetted first is if the tanks are overpowered to the point where they do more DPS than a DPS class, though in that case you're probably screwed already and should've rolled a tank if they're that overpowered.

[Amyas]

I often hear people talk about PvP as if there's some way you're supposed to actually get a non braindead player to turn around and hit a guy that does 1/3 the damage of a DPS and is 3 times harder to kill. I'm still trying to figure out how that works.

I imagine when the tank casts holmgang on you and uses the new pvp skills to knock players around like ping-pong balls people will start... developing better tactics...

[Kantide]

I bet like 2 people in here played PvP in beta. With that said, it's not as bad as the nay sayers think it will be. In beta, I found it VERY fun. Provoke forces you to ONLY be able to target the tank for a period of time. This is a fresh perspective I think will add a lot of strategy.

Every role has it's place and on paper, if done properly, it won't be just a spam fest and will require teamwork and strategy to win. I played WHM during beta and trying to heal my team, sleep the enemies, keep myself alive and raise the dead were all at the top of my priority list. BLM was OP in beta, I think the changes help but they were not getting hit nearly as much as people make it seem they will be.