So there is a bit of a common issue with Team Doubles that I feel should be addressed, and that is the spawns.
Due to the fast mobility of Halo 5 and the smaller maps in Doubles, it is VERY easy to get in a fight with a team, kill one, and then while in the process of killing the other, have his teammate respawn and come back into the fight once again, while your shields are still recharging from your initial fight with that same enemy. I feel like a very simple solution would be to extend the spawn timer by just 2 seconds. Just those extra couple of seconds would give a player the chance to regain their shields before their opponent rushes back in.