this will start you off.
and this is objectively why halo 4 is bad, written by our own fyrewulf
http://www.neogaf.com/forum/showthread.php?t=709697=
Before I get down to discussing their points on sprint I have to say their first paragraph is bullshit. Halo 3 was free at that time, of course it was going to be higher than 4.
Also fyrewulf's post hardly says why 4 is "objectively" bad. It just has a bunch of population graphs.
On to the sprint points...
I can understand some of the points made but I don't necessarily agree with all of them.
The point that players who win a battle will not have time to regain their shield can be fixed with with a good spawn system. I've actually never encountered the issue myself. I also argue that sprint reduces the downtime for those who have just died. Walking around looking for people is boring. Getting back into fights faster is a good thing imo.
I also have issue with the up scaling point. You can still have small hallways and small rooms with sprint. I agree that the map would be larger, however it wouldn't have to be scaled up. Just because that is the approach 343 took doesn't mean it's the correct one. If the maps are well designed they can accommodate both sprint and a map scale similar to older halos.
The letter attempts to use maps from previous halos to back this point up. Well obviously older maps won't work with sprint because they weren't designed to work with sprint.
The point about how you have to be constantly looking around for people sprinting doesn't seem necessarily bad to me. It forces people to be more aware of the enemies movements, it also encourages teamwork. If you're too busy to check an area get a teammate to cover you.
It's different, but not necessarily worse.
Most of the negatives seem debatable to me. And they certainly aren't objectively bad things. You also have to consider that there are benefits to sprint.
It's fun, for one. Quite a few people have agreed that the sense of speed you get from sprinting is actually quite fun. Using sprint to perform trick jumps can be awesome. It's also very useful in situations where you are stuck far from any of the action. Like I said earlier, wandering around looking for people is boring. Sprint helps solve that issue.
I can see that it has some negatives, however I also think it solves some and brings positives along as well.
Sorry for the rambley post, on my phone.
Regarding hit markers. Not sure about grenade hit markers. Will have to play with with them before I make a real judgement. Weapon hit markers on the other hand are great. It's especially nice when shooting people at distance.