At Halo 5’s launch, the server quality and match making was great on my end. The game ran smoothly and I had not seen any laggers nor encounter server issues.
But now, I am constantly getting match with high ping players. What happens with high ping players is that they teleport right and left, which renders the engagement very difficult, if not impossible. Here is a great example of such a lagger
Try to fight someone who’s teleporting all the time: Sordess's Xbox Halo 5: Guardians clip 13090092. Find your Xbox clips on GamerDVR.com
Watch at the end the guy teleport here: Gamer DVR - Xbox clips, Twitch clips and streams, Xbox screenshots, Xbox videos, Xbox DVR and more on Gamer DVR!
So, this is no fun. To me it either mean that there is not enough players and we are getting match with players across the pound. Or, the match making privileges skills over ping. This should not be, or at least it should ave a ping ceiling. Cause, from a user experience stand point, this is getting very frustrating and not fun, which will make me leave this game.
As for server stability, this is what happened one night, when playing arena. In this instance, everyone was having lag issue in that lobby. We were all complaining on chat and at the end of the round with the opposing team. So it wasn’t a single player, but all of us, which is why I blame the server for that one. Fortunately, this hasn’t happened too often, but not fun none the less.
Server issue: Gamer DVR - Xbox clips, Twitch clips and streams, Xbox screenshots, Xbox videos, Xbox DVR and more on Gamer DVR!
Also, why isn’t there a ping information for each players in the lobby, like most games do? Isn’t it a bit odd, that you hide that very usefull information from us? By doing this, people will blame your game instead of the high ping player. 
On a final note, the more I play, the less time I play at every session. I used to spend two hours straight when playing halo. I now barely do 2 to 3 games in a row and then I move to something else.
So pls 343, address this match-making with high pingners problem and server issues for December release.
Info:
Location: NA - East (Montreal area)