I've got maximum sneak skills. I throw a smoke marker grenade and hide far away in the shadows. The enemy doesn't know where I am - I am far away and not moving or firing a weapon. The artillery shells start landing, and THIS causes the enemy to instantly know where I am hiding! So then they all start running towards me and out of the artillery strike zone before most of the shells even arrive on target.
It's as though the game treats the artillery shells as a player-weapon, and using artillery causes the enemy to detect you as if you were firing a noisy handheld gun. That's BS! That's stupid! That needs to be modded out! What's wrong with you Bethesda? Artillery already takes a lot of effort to set up, and the smoke grenades are rare enough. You'd think artillery would be somewhat useful, but it just isn't.
Things to change:
1. The explosion area needs to be larger. I've used artillery many times, I've saturated enemies with fireballs, and I rarely kill anything with it.
2. The explosions shouldn't magically reveal where the player is. If the enemy can't see me or hear me, then why does artillery reveal where I am?