I find jumpbot cannons about the most rage worthy tactic in the game. I quit the game several years ago because it was done in almost every game of 4v4 or more. I would not complain if jacks were totally removed from the game. They become raiders with a 6k hp pool - very annoying. In my opinion, anything that flies should be vulnerable to AA. In other words, chainsaws etc. should start shooting these as soon as they cross into range - completely ignoring height.
Either that or it should cost 10k metal to build a jack cannon and it should just be a building instead of newton engineering.