The biggest factors regarding attrition is survivability, sustainability and control.
If necros are to be attrition fighters, we need to be able to survive burst dmg and be able to recover the loss before the next burst comes. Regarding classes with burst damage skills, it’s not enough for us to survive just one or two skills. They will chain multiple burst damage skills, then they will go on the defensive until the next burst chain.
Attrition fails if we die by the time they finish their first burst chain. If that chain consists of instant skills, and we depend on using skills with cast times to survive it, then that is also fail. We shouldn’t have to rely on getting the first hits to weaken them so their burst is lessened enough to survive it.
The way someone survives is simply damage % mitigation.
What do I mean by “damage %”?
As an example, a warrior deals an average of 500 damage to us. If we have 10k hp that 500 damage is 5% of our total HP. If we have 20k hp, that same 500 damage is only 2.5%.
Another way is to reduce the damage inbound. Higher defense rating, weaken them, buff yourself, etc. If you can reduce that 500 damage down to 250 damage, then with 10k hp you just reduced that 5% down to 2.5%.
This is where sustainability comes in. If we need to rely on skills to pull off the survivability over a drawn-out time, then our survivability skills must have sustainability regarding use. It doesn’t do us much good if we have to blow through a couple skills and then be left without any more survivability for the next 25 seconds. We wouldn’t survive that long. How many skills do we have access to in a fight? 5 per weapon set plus 5 more for a total of 15 skills. If we have 8 skills that benefit us in some way regarding survivability, then we should be able to use them in 4 sets of 2 (situationally dependent) and by the time the effects of the 4th set are used up, the 1st set is off cool down.
But what good is any of that if we don’t have control. An attrition fighter depends more on controlling the fight than any other type. Not only do we need to be able to put out damage during their offensive, but we must also be able to put out the damage during their defensive. We need to be able to negate their damage avoidance and reductions to do this.
One issue I’ve noticed thus far is that the necro attacks are too easily avoidable. Wells allow the enemy to simply leave the area. Marks can be avoided unless you cast at their feet. While some others like Plague Form simply means they can stay their distance from us.
Now I’m new to this game so take what I’ve said with a grain of salt. Although new to GW2, I’m not new to MMOs and have played GW1 quite extensively. The question you have to ask yourself is…
Do Necromancer, as they are within this game, have adequate survivability, sustainability and control to be attrition fighters?