You know they made more than one worst decision, several on the same scale. Such as Halo 3 ODST, no Multiplayer Matchmaking for Firefight, or MM full stop. Leaving Microsoft and going with money scrounging Activision and then there is Destiny itself, how many worst decisions have they made with this game (Going with Activision could be classed as one worst decision). For me, it has to be Halo 3 ODST Matchmaking. Second, would be what they did to Halo Reach. Too many worst decisions on the game Destiny. Easier to just stick to Halo as a worst decision.