From what I can tell they nerfed the Giantsgall weapons from 1.0 to 2.0. They were better than the GC weapons in terms of base damage by a slim margin but could be sloted with materia. In this version they are weaker than the GC weapons in terms of base damage but can still be slotted with materia, since you cannot increase the base damage via materia and the GC weapons have all these bonuses on them. I think they are better or I might be wrong. They are cheap in the market wards now