Depends what your goal is / what you are using your mages for.
If you are going to raid with one or more mages, then yes, otherwise for just dungeon type farming not.

Base hit chance for spells is 96%, if the mob has the same level as you and no specific resistance against the magic school.
On a boss type monster or one 3 levels above the character the hit chance is reduced to 84%.

So if you just run dungeons, take 2 or 3 points into "elemental precision" from the frost talent tree and you're fine.
If you do regulars raids with the mages you should get some hit gear - the max hit% chance you can have with spells is 99% regardless of hit% bonus.