Prolly wouldn't have a 360 without Live Gold. Been addicted to the service since the first XBox. It just works, and nicely centralized. I appreciate that, having started with multiplayer gaming in the early 1990s on PCs. Clunky as they could, and still can be.
Although I got a few friends that never touch liveplay, but still enjoy all the quality singleplayer games, or multiplayer games with good singleplayer components. I'd give them shit, but I spend half my gaming time on my PS2 it seems. Single, multi, it's all cool.