I think that people aren't looking at some little differences to Destiny's ADS system which is such a huge improvement yet so easy to implement, and Bungie did.
[b]#1. ADS sucks in most games because it lowers your speed tremendously. [/b]
The whole point of trying to add realism with ADS don't even make sense! In what world can you not run while holding a pistol in front of your face? Try it with something heavy or just your hand shaped as a gun, running around fast while looking down your hand in front of your face.
MY GOD! It's possible! We don't suddenly gain 100 pounds and can't run with something in front of us. We can actually run with up to 6 pounds in our hand while looking down the sights. It's less accurate sure, but possible. We can see in the [url=http://youtu.be/gIp7vZuYzoA?t=5m]Gameplay Demo at 5:00[/url] that he is clearly moving at normal speed while aiming down the sights. This little improvement makes such a BIG impact, making the game still about strafing and dodging like Halo and Quake, but also adding ADS for the people who prefer it that way.
It's not stand and shoot like COD, or half the games out there. It's still dependant on your skill in movement but makes you have higher accuracy with ADS, and it did factor in bullet time so you can't move super fast and always expect to hit with ADS. It's a perfect beginning to actual realistic ADS features that don't ruin skillful movement.
[b]#2. Shooting from the Hip isn't shooting blind.[/b]
Bungie has still given a tremendous option for people who don't like ADS, showing with the Pistol that there was no bloom and it was super accurate, allowing you to move from target to target fast unlike ADS. They didn't make Hip fire useless, but rather made it VERY useful by being able to switch from target to target fast, and allowing Halo fans and people like me who still love hip fire to still use it ALL the time.
[b]#3. Going into ADS doesn't lock on to your enemy, it only goes in the centre where you're aiming.[/b]
Simple point, but truth. I've watched the video numerous times and can tell it doesn't do any auto-lock on things like COD, but only makes your ADS switch go in the middle of your aim that you had with Hip Fire a second ago.
[b]TL;DR:[/b] It's the best of both worlds. Useful Hip fire with fast movement speed to dodge bullets and strafe like Halo games, and also accurate ADS for those direct shots that you need to hit while also allowing you to move and strafe without it becoming a stand and shoot match and not using cheap auto lock-on.