You "hardcore" halo fans need to grow up.
First of all, the ADS mechanic is no different than that of older games, except now it looks different. It is just a different appearance than the zoom function. It does the EXACT SAME THING.
Second of all, sprint does nothing but add to the craziness that is halo multiplayer, it is not a huge game changing addition.
EDIT: It has come to my attention that sprint disables shield regen. Even better for you "hardcore" fans
EDIT 2: You can not aim while taking damage.
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First Announcement: Woooo!!!! Hype is real!!!! Awww yeah!!! Thank you Microsoft!!! Pre-release game footage: OH MY -blam!-ING SHIT WHAT THE HELL IS THIS GARBAGE Release day: Holy hell this game is -blam!-ing awesome!!! I need to call my boss and tell him I'm sick... 5 months later: This game is -blam!-ing dead, 343i ruined this entire franchise. -blam!- gaming. -blam!- Halo. First Announcement for Halo 6: Wooooo hype is real!!!! Awww yeah!!!! Thank you Microsoft! Pre-release game footage: What the -blam!- is this garbage??? Have they learned nothing?? -blam!- this shit. Release day: This game is the ressurection of Jesis!!! OMG I love this game!! -blam!-ing GOTY every year for the next decade!! 5 months later: This game is -blam!-ing dead. -blam!- 343, -blam!- gaming and -blam!- Halo. [spoiler]I'm calling it now.[/spoiler]