While Josh Holmes' explanation for sprint was indeed a bit weak, I do think 343 is making design decisions around it that seem smart for Halo (if Halo did have to have sprint). Those decisions are namely the shield not recharging right away and unlimited sprint (it doesn't make sense for Spartans to "run out of breath" if sprint is an option as it's probably more of a function of the suit).
Also, I don't think he should have mentioned how fun it is to watch regarding the ground pound and charge because I think if Halo 5 is a good spectator sport, it'll be because it requires a ton of strategy and tightly coordinated teamwork between teams. That's what makes spectating fun, not necessarily "crowd-pleasing" gameplay. Usually stuff like that is born out of unexpected moves from the players themselves and not a certain move within the game, really. Out of all the spartan abilities, by the way, I am most skeptical of ground slam and charge. Those two just don't seem like they fit with any of the other spartan abilities nor do they seem like necessary additions.
Lastly, I still feel like what I have seen from Halo 5 (and from what I've heard) still seems to be core Halo. Halo is more about equal team starts and a war between teams over map control and weapon placements and that still seems to be very much intact for Halo 5. This is uniquely different from Halo 4 and (to a lesser extent) Halo: Reach.
I'm overall still optimistic for Halo 5, but I am more cautious given the MCC. 343 really needs to do right for the Halo fans in order to win a lot of the goodwill they once had.
I'm having a hard time caring about what they want with Halo 5, till they fix Halo MCC. I dont think I'm gonna buy their next Halo if they cant fix that collection.
This can't be overstated anymore too. 343 really needs to focus on the broken game before them, rather than start promoting the next big Halo game that's still a year away. I always saw the MCC as a way for 343 to test ideas for Halo 5 as well by learning if players really liked/hated certain aspects of Halo 1, 2, 3, and 4 or if it was more nostalgia speaking than anything.