Warlock- Has both Subclasses Maxed
lvl 31
Exotics: Claws of Ahamkara, Sun Breakers, Starfire Protocol, Heart of the Praxic Fire
Titan- Has Striker Maxed
lvl 30
Exotics: An Insurmountable Skullfort, Helm of Saint-14, Helm of Inmost Light, The Glasshouse, No Backup Plans
Hunter- Working on Gunslinger first
lvl 29
Exotics: Achypholyge Symbiote, Don't Touch Me
Weapons:
Auto Rifles- Shadow Price, Atheon's Epilouge
Scout Rifles- Badger CCL
Pulse Rifles- Time on Target, Bad Juju (Exotic)
Hand Canons- Thorn (Exotic)
Shotguns- Secret Handshake, Innvective (Exotic)
Snipers- FINAL BOSS, Praedyth's Revenge, Prudence II, Epitath 2261
Fusion Rifles- Murmur, PLUG ONE.1, Plan C (Exotic)
Heavy Machine Guns: MG18A Harm's Way, Thunder Lord (Exotic)
Rocket Launchers: Exodus Plan RS/1, One Way Ticket 000, Dragon's Breath ( Exotic)
As for Theory, I want to add to what Mael said pointing out that were are legions of the undead serving the guardians. Also Heroes are not traditionally refered to as "Titans" or "Warlocks" They are normally Soldiers, Templars, Knights, Mages, Sorcerers, or Wizards.