If you do ever manage to kill one of the opponents on those 1 vs 4 situations they will get back up instantly back to full health in 1-2 seconds.. meaning the solo player will never manage to win any of these rounds even if he played really well. the other guys can just revive one after another.
this not only applies to 1vs4 but in general as well.
Either increase the duration it takes for revive to make revive gear useful. As of now Revive speed is pointless if you have a char that have rapid revive. which revives teammates in 1 sec
or remove Revive speed on gear and make it based on heal %. so revived teammates doesnt come back as 100% hp instead it starts from 25% etc
Revive in 4vs4 in general is just broken for how insanely fast it is to revive someone