I never liked the MM Mirror Shield just because it always freaked me out... I hate how you can't change the shields, so once you get it you're forced to stare at that face the rest of the game. That's why I always swing my sword before running around in Hylian form, so he draws the shield and it's not on his back lol. However, despite being a little freaked by it, I think the design is actually really good. Like how bbevington90 put it, it's really cool how it can reflect the horror of Ikana or the impending doom of Termina. I haven't seen WW's yet, so my favorite so far is OoT, hands down.