The controversial IndustrialCraft-based GregTech mod adds a lot of hyperrealistic technological stages. Starting from using a simple mortar to combine copper, tin, bronze, to build machines from. Players slowly work themselves through more and more advanced technologies.
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Pro New ore generation
GregTech changes up the ore generation so that ores, both vanilla and the plethora of new ones, spawn in major veins rather than random small deposits. While finding these isn't as easy as with vanilla nodes, they make gathering the vast quantities of raw materials GregTech industrialisation needs, much more viable.
Pro Greatly expands Minecraft
The GregTech mod adds a huge amount of content and machine progression to Minecraft. Starting with Bronzen Steam-powered Machinery, players work themselves up to more and more high-tech technology.
Con Hard balance
While tweaks can be made through the configs files, Gregtech (with many of the changes it makes) is notoriously hard, and advancing through it takes a lot longer than through other mods.