I think this would be a great idea, essentially, it's a playlist which selects one random mutator from the weekend events, this would include Tbow Tag, Sniper Only (Forget Snipe/Booms and this week's Retro/Nades, both sucked :/), Big Head, etc.
This is great, because people like myself who hate the standard gametypes because they are too easy and extremely boring as a result, would be able to have fun with this game again.
I don't know if it's just me, but GoW 1 and 2 were fun because they were challenging. It was about skill. Now, a trained seal can maintain a 1.0 K/D and W/L, myself having a 2.3 K/D and a 5.8 W/L.
Anyway, I'm pretty bored with GoW3 now, I learned the game in under a week, and that's pretty pathetic, considering after 2 years, I still haven't mastered GoW 1 OR 2.