I was kind of surprised that the Minutemen or Preston didn't have any particular missions against the Gunners such as taking back or getting revenge at Quincy. I almost would have liked to see Quincy as a personal mission from Preston in order to get his companion perk.
It could have opened up options for the player to plan out a siege with artillery, take sniper positions, or just charge in with power armor while getting backup from the Minutemen. Currently in the game you can find Clint who betrayed the Minutemen but besides a simple "Companion liked that" when you kill him there's not much other interaction. It seems like there could have been more where the player either encouraged Preston to take Clint out on the spot as revenge or take the traitor back to the castle for a court-martial where you could then decide his punishment. The punishment could be as simple as a firing squad or lead to a few ridiculous options such as shooting him up into the sky with a timed mini-nuke strapped to his chest. The next DLC would allow you to even pit him, other traitors, or high ranking Gunners against captured Deathclaws.