I've found that in most MMOs, and specifically GW2 and Rift, that the 'meta' builds are decent, but not the best. ESO is another one. The 'meta' are just builds that everyone can easily play instantly without much effort.
The best builds are wildly unknown or tailored to playstyle. I have a Mage build in Rift that destroys every other build I've seen, especially in PvP, and I'm sure there are plenty excellent ones that I don't know about too for all classes.
Gamers need to understand that the best theorycrafters do 'not' share their findings. If you find a way to gain an advantage in a competitive situation, sharing it is stupid. If everyone is running around with 'the best'.. it isn't better than anything anymore. Plus, it'll just get nerfed.