I play on PC, because of the mods. But I sort of wish I played on X-Box, I looove talking to people when I play Far Cry 2 and Assassin's Creed on X-Box, it just makes it so much more fun for me.
Then again, I can always talk on the phone or text or use MSN while I'm playing Oblivion, so... I just need Oblivion-people to talk to and I'm all set.
Might be time for converting my friends to the Elder Scrolls obsession, but I probably won't have much luck. They're not really gamey-type people.