Why?! Are you -Yoinking!- limited? Fix matchmaking before you do anything else. Adding another playlist is just going to make getting a match take longer.
“We heard your feedback and are adding Rumble Pit back into the rotation.” What idiot asked for that? I’ve been up and down these forums and it’s all about how long it takes to get a match.
Funny though that they didn’t even successfully add it. It was probably just someone at 343 trolling anyway.