Uh, it's there. If it's still trueskill in Halo 4 then having a skill level is part of the matchmaking formula, you get matched with people similar in skill. To even have matchmaking you need to have some sort of skill denotation. I'm pretty sure it was there in Halo Reach as well, it got to the point once that I could only get matched up with like 2 other teams in the regular MLG list.
Arena was just a different weird system that just gave you ranks for wins or something, at first it tried to get individual merit but that went away quick IIRC.
What you're whining about is being able to see the stupid little rank number next to your name again, that just encourages cheating and win-trading. I hope it never comes back. Unnecessary.
Yeah you don't even know what you're babbling about. Carry on.
Arena was the only playlist that really matched you up with players with similar skills as you. I got matched up with MLG pros sometimes and I barley play the MLG playlist.
You seem to be the one who doesn't truely know how the system works and just assume that there is something there when there really isnt.
Cheating shouldn't be an issue if 343 is willing to be active with the community. BS Angel has been great a help in dealing with Arena cheaters when I sent in proof to her. She took care of them within 24 hours time.