GregTech as a central mod in a mostly IC2-based mod pack works out quite well.
When you start including mods outside that sphere, however, things begin to... break down. Balance points between various mods are... nowhere close to being on parity. This is one of the challenges a mod pack compiler faces when making a mod pack.
Gregorious feels that it is his job and solemn duty to take this decision out of the mod pack compiler's hands and answer it for himself. And he vigorously defends his mod pack from interloping mods that contain 'exploits'. After all, how dare an end-user decide to play with HIS mod in a manner he did not intend!
As a result, I won't be using GregTech anymore. It isn't that the mod itself is bad, it is simply that I don't trust Gregorious to not pull another stunt like this, and I refuse to subject my users to potential crashes on account of drama.
It is a shame, GregTech had some really interesting ideas. Some of the machines and methods were quite innovative. However, it has gone in a direction which has ultimately become detrimental to the end-user.