I suggest that 343 segment all four games into their own categories so that all games can be accessed through their “portal” which would include campaign and multiplayer within that version of the game. This way all nostalgic players can play the campaign and multiplayer they like and the current Halo 4 players would possibly make the jump up to XBOX one to play all their friends within TMCC.Another suggestion would be specific to multiplayer to make all well known maps from all the games playable in HAL0 4 speed! it would be great to play the old maps with HALO 4 capabilities.
The combined user interface is not MCC’s problem - it’s segmented fine enough, with game-specific playlists. That’s all that is needed. Nostalgic players can already play the campaign and multiplayer they like - provided they don’t run into bugs.
As for making all well known maps “playable in HAL0 4 speed”… that’s just not possible. Each game’s multiplayer engine is completely different and independent. Even Halo 2 Classic and Halo 2 Anniversary are two completely different game engines - though similar. You can’t just take your H2A Spartan with your Assault Rifle, Silenced SMG, and Gungoose and put it on Burial Mounds from H2C. Anything like that would require map remakes, as we’ve seen with the 6 remastered H2A maps.
I hope that clears things up for you. Feel free to post any other questions you may have about the multi-faceted nature of the MCC and how the different games interact here.