I'll go out on a limb here and speak the games my plugged-in teen boys live by.
Chandler, 17, is a die-hard CoD guy. I've had to go to 2 launch events. Very strange. I'm thankful he's now old enough to do those without me. Recently he's been pretty immersed in a driving game, I'd have to ask which one. I know he's got every NFS. Also Grand Tourismo? Is that a game? He took his last paycheck to Frye's and bought some crazy $300+ steering wheel w/separate shifter & peddles. It's nice but I wasn't thrilled w/such a big splurge when he's supposed to be saving. LOL! He and I play Rock Band together when we can. We both love music. He's got RB 2 & 3 for PS3 (RB1 on Wii). We prefer 2's engine. Our "band" in tour mode? The Walter E's! He's got Good Wood mods on his drum heads for better play. He plays everything in expert. Kills me. I'm a flaling idiot on the drums. I play guitar & can hit 95%+ on medium. Some things I can play on the hard level. He lost the part that plugs into the console & sends the signal (I sound like such a girl not knowing the names of these parts) to my favorite guitar so I'm still struggling with his older one. 2 of my fingers on the fret buttons were heavily maimed when I was little & don't work right. I have to really twist my hand around to get to the buttons. Grrr!!! We have easily 100+ songs from DLC. I'd suspect much more but not sure.
Brian, 15, is more into the story-type games. Recently he's been insane for The Last of Us. Game franchises he's followed for a few years include the Assassins Creed & Uncharted games. He's also enjoyed Bioshock, too. There's a few more I'm not thinking of just now. Like a Batman story thing? Something about Archam City or Assylum??? Red Dead Redemption sounds familiar, too. This kid also does a little PC gaming on his dad's big-boy computer. He's got a Steam account. He loves Minecraft. Not entirely sure what other games he does PC-wise.
Never allowed the boys to bring GTA home. Sorry, I used to be a cop. Not down with the lets-pretend-thug things like the 50 Cent game, etc. I'm pretty laid back about not censoring music, movies, games, etc. but those were the things where I drew the line & put my foot down. Moms suck sometimes, I know.
I'll have to ask if Brian has heard of or played the Half Life games. Sounds like something he'd get into.
Interesting read...even for an old mom-person. LOL!