In halo reach people have abused custom challenges to no end to get hundreds of thousands of credits in just an hour a day. Either through campaign or grifball. It really makes players who play matchmaking feel bad when they play all day just to be outranked in an hour of challenge boosting.
I’m fine with the daily challenges but the custom ones on waypoint completely ruined the ranking and created tons of inheritors. Please do not include this in halo 4.