Hunters are just the class that is most responsive to the controls. It actually does what you ask it to do without all of the decreased agility of the other two classes. People who can jump,shoot,evade,etc all within split seconds are going to gravitate towards the class that allows that. They are also smaller targets. Takes less to kill them though. Titans used to make up for that in ability to take damage. Not anymore. Now Titans die quickly too,but trying to manuever them away from shooting lanes is a chore. Warlocks can take just that extra bit of damage nobody else can,and excel in melee battles. The toughest thing is trying to be effective on all three classes,because it keeps you from specializing just in one area.

Titans just can't do that whole thing Hunters can but they're definitely the fastest and very agile.

Personally,I'll be glad to complete my Titan stuff in the next few days and go back to my Warlock. I just can't seem to get the hang of my Titan after spending so much time the last year on my Warlock and Hunter. I prefer Warlock for PVE,and Hunter for PVP,but the Hunter just barely edges out Warlock for me there (pvp). Nightstalker is just such a strong class in pvp. Gunslinger is great in PVE if you solo stuff a lot,because of Celestial Nighthawk and it's insane ability to one shot bosses before the fight even begins. Titan just feels tedious to me.

Ya just gotta get good with Garrison and Control 😂

You run both those things on your Titan and aren't doing any better than me.