This is it, folks, the end of the the line. We have already faced down the rest of his minions: Shannox, Beth'tilac, Lord Rhyolith, Alysrazor, Baleroc the Gatekeeper, and Majordomo Staghelm. All that remains is to challenge Ragnaros himself. The battle to reach the Sulfuron Keep has been long. Each encounter offers a new challenge for players to overcome, but none of those fights holds a candle to what remains. Ragnaros is no pushover; any player seeking to bring down the Lord of Fire should be amply prepared.
One thing worth mentioning about the Ragnaros encounter is that very little of it is gear-dependent. If you are capable of reaching him, then you are more than capable of taking him down. More of the fight relies upon flawless execution of the mechanics than it does the raw output of your raid group. Should your group struggle to down him, don't fret. This is an encounter that takes time -- time to learn the ins and outs, how to move, what to do, and how to deal. Keep at it; things will click eventually, and suddenly he becomes cake.