I think drakes SHOULD be able to wear giant as well. The point of giant armor is to give a little extra protection to those with such low DR that they take a hit EVERY single swing. But when combined with zerk armor ( at least at high levels- I do about 8-10 with a bluesteel weapon to Dror when he's zerked) is too much.
For the record it does not have to be a crit to do crazy damage by fighters. The fighters I mentioned consistantly do that kind of damage THROUGH GIANT ARMOR.
On a crit, they can do high 70s. It's too much, IMO. That's more than 1/3 of my HP, for crying out loud.

aimee