Currently the site cannot make requests to the Armory. We got locked out due to high traffic. We are going to update our code to try to avoid having this problem again, but it might be 24 hours until the armory lets Mr. Robot back in.
Most items are cached, and if you have already loaded a character once, it might also still be cached. So, the site is still usable, just not 100% usable. Sorry for the inconvenience, blizzard offers no information on how much traffic it will allow to the armory, so we have to just guess and test until we get it right.