This game is unplayable for myself and many others. I have a Nighthawk A7000 Router along with XFinity probably the best internet that you can get in my area. Every other game plays fine for me even MCC and Smash Bros 4 Wii U games that are notorious for having lag in them. However in Halo 5 everybody teleports and I am put at a severe disadvantage compared to everybody else and have to work extra hard to get my kills. My K/D and Win/Loss is heavily affected as well as my enjoyment for this game.
Examples of lag:
My Halo 5 experience so far in a nutshell
http://xboxdvr.com/gamer/Avenger%20V/video/12713715
http://xboxdvr.com/gamer/Avenger%20V/video/12713691
http://xboxdvr.com/gamer/Avenger%20V/video/12713703
http://xboxdvr.com/gamer/Avenger%20V/video/12713732
http://xboxdvr.com/gamer/Avenger%20V/video/12713744
http://xboxdvr.com/gamer/Avenger%20V/video/12704055
http://xboxdvr.com/gamer/Avenger%20V/video/12703847