Solution: care about new people, not just the same ones from years ago
people will change and some of them will leave you, there's nothing you can do about it

: when I co-ran the HBO League

the what?

: 2. Matchmaking too often gives me games, maps, and gametypes I don't want to play.

: There are certain Halo titles I just don't want to play: I can do
: Halo, I'd love Halo 2, I can tolerate Halo 3 in certain circumstances, and
: I really don't want to play Halo 4.

Solution: don't be so picky and only care about games from over 10 years ago
alternatively say what you really want to tell them, "just fucking port over Halo 2 and only Halo 2, exactly how it was"

: I'm happy to take credit for this development following my
: devastating court-martial of Dan Ayoub which precipitated all this.

who?

: I'm interested to hear what others would like to see from a fixed/upgraded MCC.

they should've either just had Halo 1 and 2, or not released it on Halo 2's anniversary but anywhere from a few months to several years later
I'd love to see it properly fixed but I doubt it's feasible due to the sheer amount and complexity of code; it would be a lot easier to just do it over, and I'm sure in another 7-12 years or so they will do it over
adding more code to matchmaking, especially code to restrict things rather than keep them open, will probably not help matters

additional code and other options will likely be moot anyway because of the popularity of Halo 3, it's voted for so much more often than the others that it's a major reason the active playlists are actually active
if you match just the Halo 2 players together (which would more easily and logically be done with a Halo 2 playlist), it'll be a ghost town because most players are not Halo 2 babies

matchmaking gets the attention but to many people the campaign and custom game issues are very important, especially given the angle of holding LAN parties or replicating the feel of them
some campaign missions have graphical or progression issues, custom games tend to fail with too many people, some options are missing, Halo 3 is greatly hampered by the inability to place gametype-specific objects in Forge, and people generally don't want to recreate Halo 3 and 4 maps they already made (let alone maps someone else made)