Shattering, as a mechanic, is like Adrenaline skills on warrior, but weaker and a longer cool down. However, we have multiple shatters to cover us in different scenarios instead of a single powerful shatter, each punishing or countering as per the situation, so shattering alone does not help unless the person is paying attention to the when and what.
That’s the skill argument right there.There’s also two other things to talk about: Resource and Avoidance.
As a mesmer, the resource you are provided with is illusions. Your illusions could give you various benefits while alive, like confusing the enemy or applying conditions or, in the case of phantasms, direct damage. When shattering, you sacrifice this security in a risk-gain scenario gambling your stable damage and protection for a chance to kill, counter-burst, halt, or survive. A mesmer is usually most vulnerable after a shatter because they have no illusions up to protect them, making them like a ranger without a pet[slightly stronger, but you get it, right?]. A good mesmer might be able to cover his tracks and maybe even run through more skills and dodges to get the illusion count back up, but that just shows how much they rely on illusions.
Avoidance… this is not wholly dodging. You can dodge Burst skills, you can dodge stealth skills, you can dodge pet skills. You can also dodge shatters. But, of course, sometimes a skilled mesmer will position his clones perfectly to shatter on you. However, the hole in this argument is two points: Firstly, you can kill illusions. If a mesmer places his clones all around you, it will take two or less hits to kill the clone prematurely. Phantasms are harder, yes, but the mesmer is sacrificing more when he shatters a phantasm so that’s to be expected. No other profession resource in this game, I believe, can be targeted and undone by the enemy. It would be like attacking initiative on a thief, or adrenaline on a warrior. Well, there’s the ranger’s pet, but that still follows the same principle. So if illusions are to close to avoid the shatter, you better kill them instead thinking them as non-existence barely-damaging AIs, as some do. Anything below 3 illusions isn’t that good for a mesmer unless they have IP, in which case they will be close enough for you to hit on your own.
Now, what if illusions are further away and you can’t kill them except with ranged? Well, firstly, use ranged to kill them if not otherwise preoccupied. Secondly, this means that when they run towards you, the tell will be much more obvious and you should do what you can to avoid them then. Blocks, dodge, invuln, etc. You can even kill them as they come. AoE devastates shatter builds as well.Simply put, because shatter uses illusions, the big weakness are the illusions themselves, which is why it is fine.
The main problem is that ilusionary persona gives you 1s imune without having any ilusion. If this trait was not so much more powerfull than almost everything else we would see all mesmers puting 30 points in a traitline mainly because of it.
1 second of immune maybe once per fight because of the CD, it cannot be spammed and still requires thought. For instance, would you use IP for immunity for a single second if you had time to make more clones to get more? Or would you only use it in a very crunch situation which you would otherwise die from? To make this simple, IP gives a free or extra illusion for any use. However, it is just like any other invulnerable in that it cannot be spammed and is a high CD.
Also, you say the main problem is the 1 second immunity IP gives, but you fail to address the other points I make, seemingly ignore them. Can you please address them with reasons why they don’t make shatter non-OP?
Illusion creation is easy to be done. You dodge you get a clone. 4 out of your 10 weapon skills create a clone or phantasm. Can create even more with utilities. Every single shatter has IP. Shater is insta cast. Say that someone can dodge can be used to just about everything in this game, following that nothing should have been ever changed because well people can dodge. Also moa.