Well first character was my argonian thief, who I will probably start up again later, currently I'm an orc 2 handed werewolf but I feel eventually I will get bored of that.

I have a sudden craving to become a pure mage considering destruction seems pretty cool. To those that have tried this? Is it fun?

Personally, I think it's heaps of fun!
But that all comes down to your own personal preference and choice of magic school.

As a Pure Mage you can't do without Destruction and the entry level spells there will become obsolete soon. Due to the lack of spell crafting you won't be able to use those effects in a more powerful combination. And then there is the problem of Destruction spells not scaling with your skill... But overall it's fun up to level 40.

I have always liked mages the best in any game and its the same in Skyrim even tho I feel the magic is lacking for an ES game.

Here is some advice for destruction, get both damage perks for fire, frost, and shock and impact otherwise destruction is useless. Have fun.

I fight as a pure mage and have never used the Destruction skill once. Illusion spells and Conjuration are pretty good for offence

Those two are great for offense, I just use destruction to supplement each school.

I also am in the progress of creating a pure mage, but needed some tips on how to do so. I came on here, started a thread, and got some pretty useful information. From what I have been told it's a very fun way of playing through the game.

http://www.gamesas.com/topic/1345580-new-character-based-around-magic-and-spells-tips/page__fromsearch__1

instead of destruction use alteration destruction is only useful for stunlock so if you use alteration you get paralyze which is basically 300% better than stunlock or illusions calm, but illusion and conjuration are great skills use those