War zone Boss fights:
Since the current last hit mechanic feels really cheap and underwhelming when fighting bosses and enemy teams at the same time. Here’s a simple solution, 343 should add a territories like zone after bosses are killed. Whatever team captures the point gets the credit for the boss, that way it’s less luck and more map control.
Player Quitting:
343 should add rewards and medals for staying in 3v4 games. Or they should implement a mercy rule for for games with unequal players, ending the game when a team is losing by so much.
One idea 343 could take from games like Heroes of the Storm is that if some quits then they should be only able to rejoin that match until it is over and if the game finishes before the player decides join to back, match them with other players who have quit a game, until they finish one game. Although with the current Halo population, there might not be enough players to implement this kind of solution. The Mercy rule and rejoin options would fare far better.
Punishing people harshly for leaving games doesn’t necessarily work very well. Halo has had quitters for as long as I’ve been playing. Halo’s matchmaking is very much so in the state of the US criminal system. It’ll come down on you hard if you quit, but that does stop the problem.