Halo: The Master Chief Collection

MCC launched Nov 11, 2014 with catastrophically broken matchmaking; weekly patches for six weeks barely helped, and multiplayer stayed dysfunctional for years despite a 2015 ODST-campaign apology gift. After a near-total support gap, 343 announced a public flighting program in Oct 2017, shipped the 73GB overhaul in Aug 2018 that finally fixed matchmaking, added Halo: Reach, completed the full PC port (Dec 2019–Nov 2020), then ran free seasons, Steam Workshop mod support, and mod tools through 2022–2023.

• Launch matchmaking was catastrophically broken; 343 shipped near-weekly patches for six weeks in late 2014, but core multiplayer issues lingered roughly four years before the 2018 overhaul truly fixed them.
• Studio head Bonnie Ross issued a public apology on Nov 25, 2014 promising to 'make this right,' with a free month of Xbox Live and the Halo 3: ODST campaign as compensation to early owners.
• After a multi-year update gap, the Oct 2017 Frank O'Connor post-mortem, public Insider flighting program, and five technical dev updates in 2018 culminated in the massive Aug 27, 2018 update — matchmaking fixed, LAN restored, custom game browser, Xbox One X enhancements.
• Halo: Reach joined MCC in Dec 2019, the full six-game PC port completed Nov 2020, followed by free content seasons, Steam Workshop integration, and modding tools — with smaller updates continuing into 2022–2023.