Problem with Mage/casters and Rogue/Feral is their resource - it's doing as much as giving you opportunity to use abilities on cooldowns. Energy basically gives abilities shared cooldown that can be lowered greatly by your stats and bypassed in bursts. Utility costs are way too low to punish wrong spending. Combo points were working before they implemented tons of talents giving you extra CPs without any additional cost.
For warriors resource does not matter much either, but there is one big BUT. Generating it only from meleeing and taking damage makes those actions matter a lot.
EDIT: His point is not just rage generation from MS, I bet he's more concerned in MS unlocking usage of other abilities.