I think I have to disagree with this...
Feel free to. The unit might or might not be Op, but there is nothing "minor" to specific 4 buffs and 2*far AOE buff.
If you want to compare it whit mortars you have to keep in mind that it uses lower trajectory so projectiles have less travel time and are better against moving targets. Has a barrage range of 80. Is more mobile. Can not be countered by mortars and can pop smoke to counter direct fire.