I tried Minecraft for the first time yesterday at a friend's house on the Xbox. We played split-screen, and it was a lot of fun. I think having my friend there to show me the ropes was probably better than leaping in by myself, because I had very little idea about the game -I didn't even know about night time and monsters- I would have undoubtedly died in single player quite quickly.
It didn't take me long to become incredibly impressed. Once my 360 is fixed I'll definitely be buying a copy. After I left my friend's house I kept thinking about it, about what I wanted to build and how I wanted to improve the things I'd already built, a sure sign I wanted the game.
Split-screen is very welcome, it's cool to work together or off doing your own thing. There's a lot to like about the entire game.