Simple answer: yes,
sorc is the worst dps class overall right now if you count both of their specs together and compare them with other dps specs. For the smart people out there saying look arsenal merc and marksman sniper are even below them in parses, yes that is true but both of these classes have high 2nd specs that do way more dps than any sorc could ever dream of referring to IO and virulence for example.
In short sorcs aren't necessarily weak right now, you can still do nim with sorc dps, it is just that other classes are simply better at pretty much everything.
Sorc brings a really small amount of utility to the raid that only a dps can bring, most of the time the group will have a sorc healer anyways and he brings the same utility like the dps so having a sorc dps when you have a sorc healer is pointless he can't do anything special and he does lower dps than everyone else so why bother and not just bring a fotm class like pt or marauder who bring excelent raid benefits like predation/raidbuff the ablity to off taunt a grab for orbs on brontes, or rebounders for tfb, even an armour debuff. Yes both sorc specs don't even have an armour debuff... why just at least make them useful for something.
Anyways im starting to ramble the whole point im trying to give is that yes sorcs need a buff but not because they are underpowered for the current content, but just because they get outperformed by other classes on the current content.
I hope this brought some enlightenment to some people that are just raging and are crying about how it's not possible to do nim as a sorc dps even tho it is, you just won't get taken unless you're really good so there are 2 options for you either reroll to a fotm class or become good on the class you love and show people that it's still possible to play it in harder content.