Gambit was such a cool mode as it joined the Destiny Universe and now it's pretty much dead, at least in MY experience, and pretty much a sweat festival for heavy ammo.. People that are just blessed with luck to get almost nonstop heavy ammo for their tracking rocket launcher or xenophage will rip you apart 99% of times just because how stupidly easy it is to use.
How about we tone the heavy usage down to a certain degree? Make it so that enemies don't drop any heavy so you have only the ammo box every now and then, making you think twice if you want to use it for invading now or if you want to take it and keep it for the boss later on. Even if it will be used for invading, it is usually FAR less ammo than what people get by being blessed with some luck to have easily enough Xenophage ammo for 10 quad kill invasions.
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Personally I think that if they removed heavy from add kills, they would have to make the heavy drop a lot more ammo from the box. Like filling the weapons ammo capacity