GG is actually an exceptionally good champion. They even buffed him after release although not many people noticed it. He just needs to be duped and at a high dupe level. A lot of his damage comes from his specials similar to how Storm works. He has a lot of nice utility including healing from block damage, decreasing enemy power gain, and being able to lower regen with his sp2.
So, the answer to your question is that he can be really good, but only if you have sig stones to drop into the champion.
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So, the answer to your question is that he can be really good, but only if you have sig stones to drop into the champion.