@Meddler: What's your take on Thornmail?
Some people claim it's okay since it forces ADCs to get two item types to counter it, while others (like myself) claim it doesn't work at all because getting a single MR item can neuter its damage.
But I'd like to know what Riot's take is on it, and/or what your take is on the item. Is it toxic? Is it fair? Or do you have other thoughts regarding it?