Most other reviews here talk about the fun factor, but let's talk about production value:

The dynamic lighting system breathes life into what might otherwise be over-simple graphics (although the intricacy of the voxels shines through, too). Single-player is made not only bearable, but genuinely fun in a way that is unique compared to the standard multiplayer experience, with the 'bot' system. I have only heard great things about how online matchmaking operates, but I can attest that private online games run very smoothly.

TL:DR, game is fun and good in ways you may not expect. it deserves your attention