It was sort of a happy accident with EQ class balance that the weakest classes from a PvE perspective (Wiz, SK, Ranger, Pally, Druid) are some of the strongest/most versatile PvP classes. This was just another benefit of playing on the Teams servers that is lost on Blue players. Every class brought something to the table at all times, because even if they were a weaker PvE class (say grinding XP with a Wiz in group) you appreciated having them there knowing PvP could break out unexpectedly and you'd have them in your corner.