Don't be a fool, even Halo 3 Maps packs are not free.
Yeah, but they're also more reasonably priced, except for the last one
Heroic - Free, came out December 2007
Legendary - 160msp, came out April 2008
Cold Storage - free, came out july 2008
Mythic 1 - 400msp, came out april 2009
Mythic 2 - 800msp, came out feburary 2010
versus Wars:
Strategic Options (3 gametypes) - 800msp, came out May 2009
Historical Battles Map Pack - 800msp, came out July 2009
versus Reach:
Noble Map Pack - 800msp, came out November 2010
Defiant Map Pack - 800msp, came out March 2011
Anniversary Map Pack - 1200msp, came out November 2011
Now I'll give Anni still being full price, but Microsoft comes off as silly when the entire Halo 3 content package can be bought for cheaper than 2 Reach DLC packs that came out a year or more ago without even bringing the Mythic disc into it. This is what people should get ready for as MS completely takes over the franchise, and why I'm not buying any of Halo 4's DLC unless it goes on sale, because MS would rather hold out for a couple more dollars than actually ensure the playerbase is well treated with enough DLC adoption so the DLC purchasers can actually play their DLC.
Fuck me, that's even worse.
If it's got achievements tied to it, it can't be free. MS policy