These are all about the 2-piece set bonus. Like someone posted above, just wearing the boots and gloves gives you +56 spell damage with the set-bonus. Throw a +20 fire or ice enchant on them and that's +76 spell damage from just 2-pieces.
Nice gloves but I agree, the mana shield absorbtion is useless. If you have under 6k mana for pvp using manashield makes you go oom often and this set doesn't give you a very big mana pool.
The mana shield can be used to block hits while mounted.  Also your spells and actions are uninterrupted from physical attacks while your shield is up....may give you an extra edge while trying to cap a flag in AV.
If you take those gloves + the Blood Guard's Silk Footwraps, you get +56 dmg for 2 items, wich is pretty decent. Also, Increases the damage absorbed by your Mana Shield by 285 is hella good since Mana Shield don't really absorb alot of dmg already. In my opinion, they are really good.
Are you mad?  Maybe because you don't use all of your mage skills the way you should...
I just ahve one question.  It increases healing AND dmg...  Mages heal?  Since when?  Have I forgotten a spell?  I'm probably just not thinking right, but how DO mages heal?