Oh boy, I could say something about phallic envy but I won't...

Seriously though, I think the problem here is the weapon doesn't scale properly depending on the character's race, as smaller races the gunblade looks much better compared to say, roegadyn, where it does look more like a pistol with a bayonet, rather than a greatsword with a gun-shaped rumble pack for a hilt. A slight size increase wouldn't be a bad thing, but I doubt SE would really bother with enlarging existing gunblades frankly, they'd be more likely to just make future gunblades larger. So, keep waiting I guess?