Just finally started digging into this, played some War Games and Spartan Ops - seems last week was Episode 3 then it switched to Episode 4 now. Just did those today (guess it's all on Legendary) I wanna play Episode 1 and 2 with in online matching though as it's hard as hell by myself on Legendary.
Seems they switch every week to something new (I think episodes 6-10 coming out next week). I like the challenges too that make you wanna keep playing. That damn timer, I look at it and go aww man, gotta keep going before it runs out!!
Oh well, finally starting to have fun with it. Still gotta finish it on Legendary solo and co-op so when someone's ready just message me and we can go from there