JC is on par with the other crafting professions (bar Blacksmithing if you stick epic gems in your prismatic sockets) if you still have 3 or more rare gems in your gear (I reckon this applies to most people). If you have two, one or no rare gems in your gear, then JC provides 71, 61 and 51 bonus stats respectively.
It's not as horrible as you make it out to be. I reckon the majority of people only have a handful of epic gems in their gear at most, in which case JC is just as good as it's been before epic gems were implemented.
If you want to maximize your DPS output no matter what, you buy epic gems for all your slots. And only in that situation does JC plummet to a mere 51 stat boost. My guess is that the OP is your average raider, in which case JC is still a solid profession. If the OP was in a top end guild that spares no expense to equip their raiders, he/she wouldn't be asking this question.