Yeah, I noticed they flee a lot. I think the best one I had seen was taking two Dauntless into a game vs a Light Cruiser and Cruiser. I killed the Light Cruiser and hadn't even touched the Cruiser, but the Cruiser captain freaked out and hit the warp out button!
It is interesting how they move differently, though. I got so used to playing against Imperium and Chaos being able to use the quick turn (what ever it is called), but orks can't which allows me to dance around them in an Imperial ship lol