Sounds like they're saying two totally different things here:
Each playlist within Halo: The Master Chief Collection uses an independent skill-based ranking system that is identical to the leveling system from the original Halo 2. The system uses the same exact XP requirements as the original Halo 2; players will earn XP when they win and lose XP when they lose, and total XP will determine their rank. You will have a skill-based ranking per each playlist; we ultimately decided not to have a 'master' ranking across all four games combined, given that player skill and approach varies radically between game chapters.
Additionally, we’ve also modified matchmaking to use skill detection, which will put players into the fairest matches faster than any Halo game to date. In ranked hoppers, players will be evaluated after each match and can go up or down in ranks depending on how well they perform.
So which is it? At first it's the exact Halo 2 ranking system, but now it's saying matchmaking is different. The bit about being evaluated after each match sounds a lot like the Halo 3 ranking system, which was hilariously broken.
Why couldn't they ported the exact ranking
and matchmaking system from Halo 2? It was the best system of any ranked game I've ever played. Don't "fix" what isn't broken.
So it doesn't seem like this details whether or not the ranks will be viewable in the pre-game lobby does it? I know you can go to someone's "profile" page and view their highest rank achieved, or you can view your own rank in each playlist but half the fun was seeing the ranks of the guys on your team and the other team you were matched up against. I don't see the rank viewable on the nameplate on the right side of the screen. Am I missing something?
Nope, see the bit above about a "master rank." No more having your high rank displayed for you to be proud of. You know, one of the major things that drove competition in Halo 2 and made people aspire to get a symbol. Can't have that, don't want to make the less skilled players feel less special.
In fact, it even looks like per-playlist ranks for other players might be hidden and not shown even when in that playlist. Note the "your rank" display in the corner but not on the player name. I'm guessing this means other players' ranks are hidden. Likely again to coddle lesser skilled players, as they did with the hidden ranks in Reach.
Goddammit.