Minecraft is a fun game. I love it because it's the epitome of a game where you create your own fun. Today's games are more movies than games; almost every blockbuster game I've recently played holds your hand through a series of triggers and cutscenes.
With Minecraft, however, you never know what you're going to get. Personally, I don't do a lot of construction in the game, I mostly spend my time spelunking. The cave networks in this game are ridiculous, and there's no end to dark and expansive passageways that you can explore and fight through.
Of course building shit is fun too, albeit a ton of work. Unfortunately I don't have any amazing buildings to show off.