As I understood it, all Taunts could be resisted.
Hence the orginal question - How do you know it is working? No messages in chat or log, one way or the other. Is it a better or worst taunt from a resist respective than any other taunt?
This was not intended to really be a debate about whether MD is or isn't a decent spell or what should be changed about it. 
Aven Elonis
56 Guardian, Tempest, Steamfont