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I am sure some people do. I personally don’t.
Why not it isn’t that outdated.
I personally would still play it on 360.
Still Do if you want I will play some just look at my name add me.
Most of the Matchmaking playlists are DLC locked, and it’s pretty buggy since it’s not really supported anymore. There’s maybe a few hundred that still play it despite all that. Still enough to play Social Slayer. 
You’re most likely to find more matches on the weekend, though.
Of course people still play it.
It would be hard to find a match lol
I rarely even play it, I’ve moved on to Halo 5 Guardians just because I gotta stay & keep up with Halo.
hey why not it’s a nice game
Of course, I’m finishing legendary campaign
I think I’ll play the actual game on 360 then the mess of a port that is the MCC
I still have my 360 and Halo 3, but I don’t play it there. I recently finished it on legendary on the XB1.
I am sure some do
I was thinking of playing it again but got into other games on xb1!
I still play it occasionally. currently as of febuary 1st there are 1,208 people online, sadly no one plays the DLC playlists.
Yessir!
I sure do!
I would assume for nostalgia.
At least I get matches on the 360, for some reason the MCC multiplayer hasn’t been working for me and I haven’t been able to play a match, it keeps telling me players found but they never appear in the lobby roster.