Ok, so this is MY opinion on what 343 should tweak or change. I love Halo 5, its fun, but somethings just are making me a little angry at the game at times.
Radar needs a little increase in size - Yes I know, many have said this, and most have been bashed for having this opinion, but it is a problem, as of now the radar is 18m, but it feels to small, for warzone, due to how small it is, and its screwed up way of showing an enemy on it, by the time an enemy is on you, or you realize that someone is near on your radar, you have no time to react and are basically dead. Why not make the radar 25m or 20m.
killer indicator - this is not a kill cam, so before all you bash for say, this is CoD, no, this is not a kill cam. This works similar to destiny, when you are killed, the camera follows your killer, maybe even outlining them, I think this should be added because there were so many times in warzone where I would be killed, and have no clue what, where, and how they killed me.
make allied clan tags appear at all times - this is a huge issue, when you can’t see you allies, you cannot strategies, heck, just do it for fireteams. it is annoying to have to constantly ask, where are you? where are you?
random lag - This may be me, but I have had issues where I just lag for no reason for like 10 seconds.
these are my opinions, and these are mainly for warzone, arena works great with how it is, the kill indicator would be a nice addition though.