When the game released, hunters had 180 health, warlocks 200, titans 220, or very close to that. The point was hunters are distance class with the most agility, titans where in your face class n needed the extra armour to give them the ability to be up close. Warlocks are midrange. It's changed since then diue to exotics, different subclasses etc n now titan is the fastest n warlock with ram is the tankiest with the best melee but slowest.