Kannon - Dodge, get in cover....hide behind battlements. Don't get too close to doorways with higher ground surrounding... I mean if a lootah is standing right in front of you, you seriously can't see him shoot and roll before the kannon hits the ground? Or run to cover? The only warning you get out from lascannons and plasmcannons, is if you are facing that direction...otherwise you will be hit unaware the same way a kannon gets you. But maybe it's just your luck. On my list, kannon is one of the weapons that kills me the least. I even die more times to the kannon while playing orks...than against orks.
So your experience = the standard by which to judge everyone else's experience? "I don't get killed by them so clearly there's something wrong with you"
I stated the basic truth, in that there is no way to detect them being fired at you while everything else that can OHK has a tell. But if you want to overgeneralize it, that's cool too.
Oh wait, you actually wanted me to respond serious to this? Okay then, please do tell me how i and my team fail, pretty please. Just make sure to take a look on few screenshots before you speak, so it doesnt sound so funny next time. http://forum.eternalcrusade.com/threads/novus-ordo-seclorum-recruiting.59004/