Recently, my friends and I did a little test to compare Halo 4 to Black Ops 2. Oh boy, was it fun.
We started with Blops.
We joined 5 different lobbies and found that half of the people in each one were under 15 and had quite the colorful vocabulary. When killed, the person would either ***** about the their sh*tty connection or call me and my friends f*cking retards. Mature yes. If they score a kill, it is immediately followed with "yessssssssssss", which at first made me look outside for a Creeper. Don't even get me started on rage quits. Tranzit and Zombies were quite mellow to say the least.
I must say that we did, however, meet some pretty cool people too. Of course, these people were adults. They did smack talk, yes, but not at the level that the children did.
After a couple of hours, we switched to Halo 4.
We only found a couple of youngins on Halo 4. They were quite lucid, mostly because you it's difficult to blame lag in halo. Anyone who did swear profousely was either cool with the party leader, or was kicke from the game. In matchmaking, we found the people to be pretty loud, but at least they weren't wildly inappropriate. The worst we heard that night was about a camper with a Sniper Rifle.
Conclusion- Play whatever you want, but just remember; I you don't like the overuse of the F-Bomb, Play Halo 4.