I'm not sure why you thought you'd see different opinions here than elsewhere. All it's likely to be is a rehash of everything you've already seen.
I personally don't care for the extra tier of machines GregTech adds. I don't care for much of its additions at all as half of them are redundant and expensive "alternatives" to other mods (often with lesser functionality) and the other half are overkill. I think the three big things it messed with to start with, solar power, electric tools, and UU Matter, are all things that were overused by many players and drove quite a few alternatives to obsolescence including some things within IC2 itself. They were obtainable too early. Making those harder to obtain gets people to use items they never did before, such as IC2 Bronze Tools, and the Mass Fabricator is hardly more innocent than EE2. Of course that's where GregTech should probably have stopped, and it probably went a little too far by introducing such obscure items as the requirements, such as silicon cells. Pretty much everything about it is overkill, both in what it adds and in what it changes. I don't think it's the terrible monster people paint it as, but he probably should have taken the usually reliable advice/phrase to heart: Keep It Simple, Stupid. (Not calling Gregorious stupid, that's just how the phrase goes.)