Yeah man, actually they put stats and literally every data piece from the custom games into its own library called "customs". I.E. halo had social stats(social team slayer, big team slayer), ranked stats(mlg/snipers/lone wolves/ranked team slayer), and then you had private/custom games which were completely separate from regular multiplayer's stat sheets/bounties/achievements however your stats were still recorded in another file labeled "customs". >This is great way to improve yourself, and privately I might add, instead of doing an inconsistent matchmaking experience.