let's take this idea a bit further (and also parodize the stuff out of it because forget'S SAKE it's SO BAD LLLLLLLFGH)
what if, instead of one, consistent map, play took place on a small section of a larger map. in order to win, you simply need to wipe out the enemy team with your crazy, ludicrously effective assault-instagib-rifle while still dodging their fire by moving at the speed of forgetin' sound
but the trick is that the rounds are designed to be super short (30 seconds is adequate, 60 seconds is long) so there's less emphasis on keeping yourself alive as much there is keeping yourself alive so you can continue to shoot other dudes. in addition, the center of the field- where the two groups of players spawn randomly within- holds a power-up (Heavy Machine Gun, Flame Shot, Shotgun, ROCKET LAUNCHER!!) that, when grabbed, will stay with the player until he is killed by an enemy or 'retreats' by leaving the small boundary that the players are allowed to fight in
collecting this power-up will cause a random player on your team (but not you) to upgrade instead
the power-up gives you a sort of incentive to want to stay toward the center, and also gives players incentive to rush toward the center blindly (and thus immediately find a conflict) and also jars the power balance oh-so-slightly so there's a little bit of an uphill battle on both sides but, due to the fact that the starter weapon- the assault rifle- is ludicrously practical will never stay in play too long and as such will never become too much of a weight toward either side
instead of fighting on a per-round basis, the game could be played in a more 'tournament' style; each round is probably about 30 seconds, but teams play to 11 rounds, extending the matches to around the 5-minute mark at a minimum and 9-minute for really tight, heated matches