The question makes the point that what's "wrong" with Gambit isn't any particular weapon....and is unreasonable expectations for the kind of experience that the game is "supposed" to give. No one is going to invade at a 1v4 disadvantage....under time pressure....and is going to get in a series of primary gun fights. They are going to come with the fastest killing method at their disposal. So they can do as much damage as possible before they are killed....or their timer runs out. Which means OHK weapons, LMGs, or supers. If it isn't Truth....it would be something else. Because the optimum strategy doesn't change.