Guys, when you brought in Real Life™, you lost. All weapons, ranged, melee, or magic, do the same kind of damage: hit point reduction. That is why the T-Rexes do not eat the characters, why no one is shot to ribbons when fighting against men with machine guns, why you are not gored on the tusks of whichever huge beast, and why lungs are not seared/frozen when a person takes a huge spell to the face. Anything bad happen to you? It happens to your hit points. So as long as your damage modifier is high enough, use whatever holds your fancy; that will be the most effective weapon.

Gunblades are impractical weapons. One may need a gun, and one may need a blade, but not usually in the same breadth. When your gun barrel's underside is entirely blade, where do you put your hand to help steady the shot? When swinging your blade hard into an enemy, do you not think the gun assembly is going to hold up under all that jarring? There are better tools suited for the job than a Swiss army weapon, which a weapon tries to do multiple things, and poorly, rather than doing one thing well.

In the case that you argue that gunblades do not shoot: refer to the original poster, who talked about guns and swords. The vibrating gunblades are stupid too, but not worth more attention than this comment.