I love some Minecraft, but moved on to
Space Engineers now. I have logged 700+ hours on Steam in it. (Most of that is leaving it running while I sleep so Refineries keep working on Ore. :) ) The same company, Keen Software, is also working on Medieval Engineers which is fun too.
Minecraft though, I often argue is one of the greatest game achievements of all time. It's simple, but deep. It's easy to play, but gets complicated if you want. It's highly mod-able and the replay value is insane. It's definitely in the top 5 best games ever made, regardless of what your opinion is on it. It's far from a game for kids, but it's also the perfect game for kids. When my daugther was 10 and 11, she was on build teams, and server teams, and made cities, and all kinds of crap. She learned a lot playing it, how to type well, and many other things just from this $25 game. She always hated me because I built cooler crap then her, but hey, can't let your kids outdo you too much right. :)
If you start a server though, I would play some, why not. Anyone wants to check out Space Engineers, I would be happy to coop build in that as well.
Steam Name: Kiado (Go figure)