what the fuck are you on about? No... it really isn't. If someone does that then yes I would call that cheating. Play the game as it's intended to be played. If you wanna play Gregtech fine, go for it. If you don't, fine, go for it. Neither way is cheating and if anyone calls either cheating then they're morons.
Who are you to say how a game is intended to be played? I could make the argument that it was intended to be played on the hardest difficulty, and the other difficulties are just for the people that are bad at the game. If you go by that philosophy, any modification to a game (i.e. FTB) is cheating.
So, we're all cheating just by logging on. Making that argument is just silly, because it's obviously not true.
But, hey. I've obviously upset you, from the mass of name-calling that you've resorted to. So you win. It's not cheating. Playing with GregTech is much easier than playing without.