By what metric? One could argue that more people play Hunter or Titan because they are subjectively better (more OP perhaps?) One could also argue that the stats, given avg calculations and general community data, are offset by that fact and are influenced by a smaller Warlock population. To say, objectively, that one class is better than another in all situations, especially in a game as limited as Destiny in its approach to variation in combat encounters, is false logic at best.

They have the least damage capability through all their subclasses All their supers do is help themselves, or clear adds. Which a primary weapon does. Their BEST talent, Fireborn, requires them to DIE. I could go on.