Results in doing what ?

5 Mages will blow almost anything up casting 5 Supernova's. They would be a good rep grind aoe farming team but as far as trying to do Heroics or current stuff id say you will need a Tank and Healer with you.

I have a 3 Arcane mage + Prot War + Disc priest team that are all about 660 ilvl but my other team is a lot stronger which is Prot War + Disc Priest + 3x BM Hunters.