Well, There is pretty boring... fairly sterile world, nothing to do, etc. The concept is good, but it's pretty vapid.
Second Life is like There's creative half-brother or something. The game creators basically said "here's a world... make stuff in it". They give you avatar tools (to make you look however you want), building tools (simple polygons, but you can make a LOT of things with basic shapes and sizes :), and scripting (LSL, like a cross between Java and C++).
So far, these tools have let people have a full-fledged war (people invented guns in-game, and used them on each other), a tax protest (the creators changed the way taxes were calculated, so everyone got together and marched along the Newbie Welcoming Area with shackles on their feet and big protest signs), a coupld weddings, lots of vehicles, a carnival, and so on.
It's really a REALLY fascinating game... it's had me hooked since July.
No, I'm not being paid by Second Life to tell you this... I'm just an addict http://www.secondlife.com/
Go there... tell 'em Lordfly Digeridoo sent ya