Halo: The Master Chief Collection is having to fight off more than the Covenant today! Launch day is having some serious multiplayer matchmaking issues. It can take up to several minutes and it may not be full. That’s assuming a match is found at all. Plus one are encountered infinite loading screens following a match, requiring a reboot of the game.
On a happy note, when and if a match is found, performance is stable, at least.
Developer 343 Industries is aware of the problems, and notes that it is working “around the clock” to resolve them. A server side update has been issued, which 343 says has shown “some improvement,” though we haven’t noticed any significant changes. Updates on the current status of matchmaking will be made here, on the Halo Waypoint forums.