Yeah, Minecraft can be a lot of fun. I like it because I just love exploring. Since Minecraft generates map as you move farther, it's great for me
Of course it's just an alpha now, but I'd recommend people watching some vids and maybe giving it a shot. As it is alpha it's half off; only 10€
These got me interested:
X's Adventures in Minecraft - 001 - Shelter from the Black of Night
Mine The Gap