While I don't have a Mage on this server I do play one on Kargath and they are one of the top three classes for me so far as far a sfun factor goes.
My guy is going to be 31 in Frost with some in Fire and enough in Arcane to be specialized in Wands (7 points 5 in improved arcane missiles and 2 in wand specialization). So I guess i aloready violated the principle of not spreading the talents over all three trees.
I do not kite things. I have enever been any good at that since my EverQWuest days. I guess I just prefer the one at a time kill them before they lay a paw onme type of Mage.
For Melee monsters, I hit them with Frost bolt and then as they are slowly coming towards me hit them with a Fire Ball and Fire Blast then jsut as they are closing for a hit they get a Frost Nova. I then back up a bit and hit them with another fire ball and usually a few wand hits or another Fire Blast will take them down. If they take more than this then they are too big for me to handle at that level and I will waitn anothe rlevel or two until I can handle them as described above.
Casters are much more fun and are handled much differently based on how they fight me. But I normall start with a Pyro Blast (much slower casting, higher damage Fire Ball) and then will follow up with a Counterspell as they normally lead off with their best spell, then either blast them with spells, arcane misslies is a favorite here and also wroks well in messing up melee attacks if timed properly, or just hit them with the wand over and over and over.