So ive been looking at this mod/addon called gregtech. I had it back in the ftb ultimate pack( I think) and i didnt really use it.
So, what are some pros/cons of it? Looks like it takes ic2 and buffs everything, almost. Should i add it? CAN i add it?
In theory you can add it, you may have to do some config modifying to get it working correctly.
As for the nerfs, some of the really annoying ones (e. g. only 2 planks per log) can be disabled in the configs, but it still introduces an entirely new tech tree for IC2. Before being able to make electric machines you have to go through the Bronze Age, which includes a bunch of IC2-like machines powered by steam. In the end you'll be able to make the Bronze Blast Furnace, which you need to make Steel and craft electric items.
Point is, with GregTech you generally progress much slower than without, but you also have access to a bunch of new machines, which in the end really pays off IMO.
Pro tip: the Bronze Blast Furnace takes forever to make Steel, and Railcraft's Blast Furnace can only make Steel from dust with GregTech installed. However you can also just put 4 Charcoal and an Iron Ingot into an Induction Smelter, which is MUCH faster.