This is so far beyond incorrect, i have been playing fire since first raid day and i am always top 1-2 DPS. I have a 3942 GS and 62% crit chance fully raid buffed. I am consistently around 800-1100 DPS higher then the arcane mages. I have not been out damaged in ANY 25 man content by any arcane mage. The only time an Arcane mage was even close to me on dps, was on Patchwork, where they did 5.2k DPS and as FIRE I did 5.5k Fire is far superior to arcane if you know how to gear correctly. It requires far more knowledge and Skill then Arcane. On Thadius25 I pulled 11.7k DPS and the closest Arcane mage was 8.7k.. People need to stop promoting Arcane mages as the Best T7 dps, it's only even CLOSE around the 3k-3.4k GS once you get some naxx10-25 loot, you see the CLEAR advantage to FIRE. Even Frostfire mages are out performing Arcane atm.
Another note: Arcane mages are MUCH easier to learn then fire, the rotation is boring and tedious, but it ultimately MUCH easier to learn/master.. with the traditional Arcane spec you are also practically hit capped just from talents you only need an extra 8% spell hit chance in 25 man with boomie or shadow priest present. SO for someone looking to play a mage for the first time, I recommend Arcane for brainless gearing and rotation management. With that being said, if you would like to play a mage to it's full potential, and you are ready for a challenge.. pick up FIRE it is far more rewarding to master and MUCH more fun to play.