The mobs cause too much damage. The devs confused " make a more difficult module" with "make every single monster able to one hit you". Epic Dungeons and Skimishes are nearly impossible, and the normal content, wich should be playable solo barely is.
I only received the e-mail after the codes were disabled, so I didn't even had the chance to redeem it. It's easy to find the people cheating, Criptic just need to punish them and give the items as "bound" and to accounts that existed before April 19, as chrcore said. (By the way, I play for almost eight months, by the…