well you arent supposed to clearly see the difference in characters.
you are already supposed to be aware of where your team members are around you and what direction the enemy WOULD be coming from. based on using the map, spotting things, and covering directions that none of your team is currently facing or pushing toward.
always based on objective captures and the likely locations of enemies.
if it was as simple as red team vs blue team, it would just be another mindless shooter.