Needs a rework. Few ideas just tossing out dont know if they would work or not.
Rockets should cast under 3 seconds and travel 10x faster so they are harder to avoid because current version is so easy to dodge.
Catapults should either do less damage or be snareable. Demos Tank need a huge buff to the canon damage hits players for ~2000 fires half the speed and the whole thing moves slower. Make it like the Island of Conquest tank with flame throwers but limit how many you can have 1 per base. It needs to be worth using because current version is trash.
Offense should also start with some seige right off the bat. Then make Defense Tower Canons worth using against both Seige and players and repairable. 300 damage shots is a joke.
Back in Wrath you could actually use Engineering bombs to do Seige damage to the walls as well(if I remember right). Add bombs for bomb running.
Final addition blizz promised us flying combat on the Wrath box! Give me gyrocopters to do bombing runs! (fix all the bugs as well)