Better Exotics
Exotics are meant to be special, capable of things no other weapon and armor can do, and be good enough to warrant the effort of obtaining them. While there were a few Exotics out there that were worthy of being worn and fired, not all of them had that special something.
More often than not you could find a Legendary that could do the job better without wrapping up your one Exotic slot. But even with some of the good exotics, you had to work hard to unlock the perk you got the weapon for in the first place. After putting in hours of work to obtain the weapon of your dreams (like that ridiculous quest line for Thorn) you had to then put in hours to make it worth using.
Bungie fixed that up by giving the perks you got the Exotic for (usually the one that shares a name with the weapon or armor) at the very beginning. You can then level the weapon up to unlock some more perks that sweeten the pot. Take Touch of Malice for instance. You have access to unlimited ammo from the beginning in exchange for some of your life. But, if you take the time to level it up you can unlock the ability to heal with kills. That’s how you build an exotic.