With a 100% critical archer build (ah, the joy), glots armor opens up a lot of doors for me. Maybe I can do a revised version of it. Dragon arrows SUCKS compared to 100% crit archer builds. As a side note 100% archer builds only seems really good with warriors, not mages.
However, in my current mage build, glots armor can help save my mages from the totally IMBALANCED blood shaman.
See, I usually throw away summon units and such to raise my rage. This strategy is extremely bad against the orcs, since it feeds their adrenaline.
Not fun seeing an ogre HURL my MAGIC IMMUNE phoenix into the air... and die.
Or, seeing blood shamans take out troll and rune mage stacks...
Of course, magic shackles seems to be a little more efficient than glot in this case.
I can still see it being somewhat useful to block the first hits of a very powerful ranged stack. I can't wait to experiment more!