Well, the character designer Tetsuya Nomura designed Squall and Seifer to be exact opposites. Everything starting from their mirrored scars, to their attitude. Even the Gunblades - Squall holds his Revolver with both hands whereas Seifer yields his with just on hand.... So maybe they're equals ???
However, I never really thought Seifer was
weak. Yeah, he does get owned every time he decides to screw with us, but he was always overpowered. Seifer never used the trigger, like somebody above said. He always found himself fighting three of the good guys at once (yeah, you can choose to fight him solo, but still...). He
never used a GF - in fact I don't even think he has one, lol

Heck I haven't even seen him use an item....
But for the most impressive feat he accomplished..... I saw Odin come down, and I laughed.
HAHA Seifer's gonna get thrashed. But wait....
what???? He just
sliced Odin in two.
Squall could NOT have that done.