Vanilla Quests
Train Borrowed Troops
Despite having the Perk where Tier 1-2-3 units receive a Small XP boost each day (and farming as many Looters as I can) this quest is simply too difficult to complete manually. I suggest instead, give additional Borrowed Troops and/or upgrade half of them.
The number of times I've attempted this quest and had near completions of it, only to fail it on the last day has been immeasurably frustrating.
Need access to <Village> commons
My experience of this quest has always had an impossibly short duration and often fails me as I'm making the journey to the destination. I suggest increasing the minimum completion time to at least 10 days.
Same as above, the time of day really plays a huge part in whether or not you're able to complete the quest or not.
Fencing Stolen Goods in <City>
It doesn't make sense as to why the stolen goods would need to be sold within the town they were stolen from. I suggest during the event where the NPC approaches you after attempting to leave the City map you should be able to use your Social Skills to deceive them, or bribe them to look the other way or as a variation to the Vendor NPC a small number of guards appear and you can fight your way out of it resulting in a criminal rating, but still completing the quest.
Missing Daughter
I enjoy this quest, but I wish it had more substance or options for solving it since interacting with either the man or woman results in the same conversation. Interacting with the man should result in a different conversation tree where the player is given the option to bribe/threaten/fight them where as the woman should rely on your ability to persuade them.
Escort Caravan
I find this quest to be quite uninteresting, but it has good potential. I suggest that along the route which the Caravan takes, there should be a chance for hostile 'caravan raiders' party to spawn around the Caravan (minimum of 2) which gives them something more to do. Alternatively, talking to the Caravan and choosing an option which makes you follow the Caravan (until it reaches a destination)
I find with this quest, I often attack near-by hostiles to give me something to do while I babysit the Caravan in my line of sight.
<Criminal> needs help with Bounty Hunters
I dislike being forced to clear out hide-outs because I find that it is one of the more frustrating parts of Bannerlord, even with Tier 5-6 Equipment, a Hideout which has too many Bandits present is simply impossible to deal with. Due to similarities of the Village quest I suggest instead a 'Bounty Hunter' party is spawned near the City which the Player can either pay the bounty, or fight them and release the Criminals partner afterwards.
Family Feud
As I've only really been able to complete this quest by taking the Son to the other family, you should be able to intercept a 'Bounty Hunter' party who would reach the town and take the Son prisoner. If you successfully fend off the Bounty Hunters before they're able to capture the Son you earn additional Denars or Reputation with the quest giver.
My only issue with this quest is that handing the Son over to the other party results in a 'fail', though I understand that your quest was to protect his Son.