Since the launch of 343's remastered Halo: The Master Chief Collection, many players have been reporting a laundry list of issues.
Some of those, when players can actually connect to the multiplayer servers, include matches with skewed teams. You can see an example of that in the video above, where player Mark Edward Neace Jr, known on his YouTube page as BingeGaming dotTV, connects to a Coagulation map (the big map meant for vehicles and snipers, mostly) for a...four versus six match. And he can't stop laughing about it. As Halo players will tell you, the 100 kill-count and assault rifle default starting weapon are not the norm for this kind of round.
343 is already aware of a handful of the issues players have been experiencing—including this one—and is working to investigate/fix them just a day after the collection has launched.
I haven't played the campaigns since the last patch that 343 issued, and so I have personally never experienced the campaign-related bugs some players are facing, but I'm not alone. It seems to be hit or miss as to who is struggling through with what bugs.
We'll keep you posted on how things progress for the Halo collection.
Update: Looks like the Halo community has put a document together to track all of the issues the Collection is seeing. You can check it out here.