Mages have always had solid sets. At worst, they've been boring. At best, they've been understated and awesome.
Tirisfal Regalia, for instance. I ADORE this set. It's so clean and simple, yet so appropriately Mage-ish. Very, very few sets I've disliked (and those were because they felt wrong, not because I disliked the set itself, as with the Ghost Rider one).
The Kirin Tor set, with pants, is probably one of my favorites in the game (if not my #1).
T10/11 felt too Warlock-y. T15 is meh. I like T16 though.
T13 on a gnome is 100% perfect.
[EDIT]
I swear to god, this is going to be the thread that makes me resub.
Edited, Nov 17th 2013 3:51pm by idiggory