Fire has changed a lot over the years. From being the top DPS spec in game, miles ahead of anyone else in Vanilla with rolling ignites, to finally talenting into Pyroblast in Wrath, the (second, if you were around long enough to remember the first) Combustion revamp in Cataclysm, and finally the Fire of today.
At the heart of it, we're still chain-casting fireball, but the spec has received quite a number of changes over the years. I'd like to find out when you guys personally preferred fire spec.
My favorite time periods:
Vanilla because of the massively overpowered 5-stack Ignites and having the mages roll you all the way up KTM to your death.
Wrath which gave us Hotstreak (making Pyroblast a talent we finally stopped skipping) and Living Bomb, in addition to bringing our crit damage bonus up to 175% instead of 150%. Can't forget about the iconic Frostfire Bolt specs (LB/FFB & CS/FFB) either that unfortunately went away. Only time in the game where Fire had three viable talent builds.