draxil
Chieftain
I'm starting to think that they really are. We saw in 2K Greg's video that a trebuchet was able to wipe out almost fully healthy units. I think he was able to do that a couple times once his unit got the "logistics" promotion, which enabled him to attack twice per turn.
What do you guys think?
The experience of the treb. aside, it was also only effective because Greg had a screen of infantry protecting it and a nice bottleneck to make it easily defensible. If you neglect the defence or the enemy can attack from any angle then your artillery will be gobbled up by cavalry.