Before I got my own PS3 console earlier this year, I played 'split-screen' a couple of nights a week on a buddy's machine. As long as you remember that it's just a game and not a way of life; it's not a bigger time waster than as a movie or a TV show (most of which are mediocre to lousy these days).
My game tastes tend towards the 'First-Person Shooters', such as Wolfenstein (single player campaign mode), Call of Duty Black-Ops #1 (on-line, multi-player & Zombies modes), and the newly released Black-Ops #2 (some on-line, mostly learning the new Zombie mode in single player).
There is a social aspect to playing on-line with a headset. There are about 6 of us in a 'Clan' (sorta like a bowling team with guns);
since we play together semi-regularly, we can exploit the concept of teamwork in games such as capture-the-flag. Although it doesn't happen often, you do get some trash talking adolescents, sounds of household chaos (the mikes pick-up everything), or worse, the guys that play Rap at max volume.
But it's easy to mute them with a push of a button.
The only thing that really spoils the game for everyone are the guys that hack or use lag switches to win at any cost. After you gain a bit of experience, they're easy to spot. They're not really fooling anyone; but the PlayStation Network doesn't seem to do anything about it. Turn-key equipment/software can be bought on-line, so it's not even in the class of a clever stunt anymore. ............James.