You reversed them. Call of duty has plenty of modes where KDR doesn't matter (domination, hard point, headquarters etc). While going massively negative will make it harder to win your team still can, and I've seen it many times. (Enemy teams kill whoring in Dom, but end up losing because they didn't cap). Destiny, almost every mode is a death match variant. KDR is the single biggest and often sole deciding factor in who wins. Only exception is rift, and to some degree skirmish when a team can win off revives but go negative.