I recently unlocked it and I was excited to use it for attacking on breakthrough to open the way. My god was i disappointed. It basically does nothing. And you can't use it at the times where ut would be highly effective.
Honestly, these devs dont know what they're doing. The maps are generally poorly designed and so are the gadgets and weapons.
I can respect balance for a fairer game. But this is dogshet. Mortars are supposed to be effective. They dont call it over the top for nothing.
All-in-all, they're nerfed to bits. Theres duck all damage. Shet accuracy. You get zapped by a gae sniper drone. You're marked on the map. You can't use them because of blue zones, especially for Breakthrough attacking, which is broken and would balance things out for attackers. And like others have mentioned, you're taken out from your support and objective capping duties.
Honestly, just remove them from the game at this point and call it a day. Its useless. A waste of precious materials.