The reason I enjoy minecraft is because I play alot of games like sims, and simcity etc. and love the freedome you have in creating stuff, be it an underground pyramid, to skyscrapers, its (almost) free, and it combines simcity AND the sims together with real people online.
to see what other people make and getting inspired to build something bigger, better, badder, and all around awesome! just makes me feel good :biggrin.gif: (not to mention the nice people here ;P)
(also its one of the only 3D Fps-ish game that runs on my computer xD)