Let's talk about something that I feel is detrimental to the game's long-term health: people's near-fanatical obsession with "efficiency". The word's in quotes because it doesn't mean what these folks seem to want it to mean. Efficiency, in fact, can only really be measured as a time to performance ratio. To the fanatics, it seems to mean cutting corners no matter who's toes are stepped on. Which, in turn, leads to unjustifiable job discrimination based on negligible (at best) data.
Since the expansion's release, too many people have looked for reasons to exclude the new jobs (as well as certain jobs prior to the expansion) from endgame activities based on misleading numbers from content that had not been tuned for the average item levels of the average player. This has lead to people excluding Machinists, Bards, Astrologians, and Paladins based on an irrational obsession with DPS. Yes, I know about the DPS checks in these new fights. It doesn't justify forcing a longtime PLD to hop on the WAR bandwagon simply because someone with an adding machine glued to his hands makes a forum post deeming WAR the most "efficient" tank. It does not justify a MCH or BRD being denied a spot in an EX primal fight because of an Excel spreadsheet.
In short, it's OK to look for ways to optimize each job's performance. Having to needlessly change to some flavor-of-the-month job in some misguided search for "efficiency" really is not.