It seems to me that all three classes are meant to work together. Check out every single fireteam in any promotional material for the game (aside from the fact that it's simply smarter to play in a group that has all of the abilities available). So, Hunters do not despise Titans or Warlocks inherently. True Hunters, Titans, and Warlocks see the value in teamwork and appreciate the other's abilities. They understand that fighting The Darkness is the ultimate goal, and are willing to put any petty differences aside in order to accomplish bringing the Light back to the universe. A True Guardian hasn't the time or the patience for childish squabbling over which class is more powerful or better than the others. They may have their own personal opinions on the matter, but most are wise enough to accept that they cannot defeat The Darkness alone. It is a foolish Guardian that squeaks and screeches of such things as a "master class", for his eyes and ears are not truly open. Only his mouth is.