That's thought-provoking. I've had a couple of the other adults in her life recommend it as a good, wholesome way to satisfy her curiosity about computers and games. All else being equal, I guess no gaming is best (I personally gave up gaming as a senior in high school to pursue a better life) but I also feel like prohibition results in its own problems.
I would say Minecraft is definitely a positive experience on a child, in moderation.