If the Iridium requirement for the MatterFabricator were removed so that the player wasn't highly encouraged to maim their world to have a chance at making it, and so that making one was less luck based (Titanium and Chrome probably also need some find-able sources in more than just the biomes where Bauxite and Rubies spawn...) and more effort based (i.e. expensive is preferable over just plain rare), then I would probably feel a lot better about GregTech. But it doesn't really make the tier worthwhile, as Enigmius said, with most of what it's offering being overpriced equivalents to barrels, RP sorting systems, the auto crafting table, and the charging bench. If someone wanted those things, would it not be more preferable to go with the mods that have these features for so much more reasonable cost? This particular point is fairly significant for Feed the Beast which is only missing the Charging Bench. Even the Sonictron is going to be shoved into messy, overpriced obsolescence by Computer Craft.
P.S.: To explain my earlier complaint about the Sonictron, its GUI is entirely unhelpful in figuring out how to control it, there's no explanation of how to make different pitch notes, and at first glance, allowing you to have it show any block in the game is confusing, messy, possibly not needed, and makes it take that much longer to cycle through to the things you want to use. It's not user friendly in the slightest.