If a Rogue is high enough level for Lethality then on rounds where Pinpoint Attack activates they deal the highest damage of all the classes, at the expense of having four primary attack stats (Accuracy to hit, Perception and Intelligence to damage, and Dexterity to activate Pinpoint Attack). Three of these are primary abilities, while the fourth is a secondary ability. Now one is going to be raised to increase Defence anyway, and one is a useful stat in general, but compared to the Warrior's three important stats (Dexterity, Fighting, and Strength) or the Mage's three (Accuracy, Intelligence, and Willpower), Rogues are the only ones with any pigeonholing of their secondary ability increases (Intelligence, for more damage at level 10+).
Plus, because to keep their combat game on par Rogues have to invest in three primary Abilities their fourth, Communication, is probably going to suffer compared to a Warrior or Mage interested in it (who both get it as a secondary, and so can pick it freely without taking away from their combat game). The class meant to be the face has to pick between that and keeping up with the other two in combat.
I am assuming that all classes want some Constitution, but not at the expense of other stats.
It's interesting, barring edge cases for the Rogue, two classes are very well balanced. The Mage however has been given a hit in the combat prowess, but the utility spells that should make up for it are absent. Then the mage's utility is gutted even more by a) the relative lack of noncombat talents (only half the list is noncombat) and b) their lack of talents compared to everybody else. Fantasy AGE could do with more talents as it is, but Mages get a shockingly small number.