I don't want this to become a flame thread, but I doubt any of you have experience with Minecraft. Their diligent dev team realeases new features every Thursday and their code is extremely complicated. I made an account on this site just to tell you that. 

Minecraft itself is no more than a LEGO simulator with a bit of electrical engineering.

However, there are so many amazing mods that add so much to the game. Add machinery with Thermal Expansion, rail networks with Railcraft/Traincraft, go to space and the moon with Galacticraft, go to different dimensions with Mystcraft, perform alchemy with Equivalent Exchange, build complicated computer networks with Applied Energistics. The list goes on.

Honestly, I don't.

I understand why some people might think so, but from my point of view, the game would suffer if many (though not all) of the changes I've heard proposed were implemented.

There's not one single thing wrong with that. :D

I love Minecraft as it is.  I really can't imagine how a big developer would make it better.  Too many people messing with a good idea tends to turn out really bad. (SEE:SPORE)  The one thing I feel could use serious improvement is the terrain generation.  Something more broad and intricate than the haphazard biome system they have now would be great.