The rules are inconsistent, and it's hard to tell what's a rule and what's an off-hand reference to how a rule usually works. The section on temp hit points, for example, (PHB, page 293-294) seems to strongly lean towards minions benefiting from temp hit points since they act as "a layer of insulation that attacks have to get through before they start doing damage".
On the other hand, it does add complexity to a type of monster designed specifically to avoid complexity. And the above quote implies that temp hit points step in before resistances or vulnerabilities or "if you damage an enemy" clauses in powers, which I don't think is intentional.
One house rule I've seen around here and am pretty fond of is a sort of compromise: minions do benefit from temp hit points. Any hit that is completely absorbed by those temp hit points does not kill the minion, but it does remove all remaining temp hit points. But that's guaranteed not RAW, while the other options are at least arguable.
On the other hand, it does add complexity to a type of monster designed specifically to avoid complexity. And the above quote implies that temp hit points step in before resistances or vulnerabilities or "if you damage an enemy" clauses in powers, which I don't think is intentional.
One house rule I've seen around here and am pretty fond of is a sort of compromise: minions do benefit from temp hit points. Any hit that is completely absorbed by those temp hit points does not kill the minion, but it does remove all remaining temp hit points. But that's guaranteed not RAW, while the other options are at least arguable.