Here's a little point that has occured to me regarding the lack of Ancient personal weapons.
The Atlantis explorers have found all sorts of useful items, such as a personal shield and lifesign detectors, and big weapons (chair powered and puddlejumper drones and the space station gun platform), but no personal weapons at all.
Did the Ancients not have personal weapons and rely on their big stuff? Have the team just not found the armoury? Or did the Ancients take all their small arms with them when they left? And what sort of weapons would they be? Projectile or some sort of beam weaponry? What would power them?