++ on this one.
System that's very convenient and could reward the mc or other character without anything in return for mission is what I hate the most.
Like:
Quest: Piss on the Toilet
Reward: 200 gold
or
Quest: Achieve rank 2 Ching-Chong
Reward: Bing-Bong Cultivation Technique (Peerless-grade)
is something that I hate. The objective might range from doing something mundane, up to kill God,, but being able to hand out reward just because is not great.
The exception of this is system like in Experimental Log of Crazy Lich. In the later Arc, there's a world war and the MC's faction created a mission system which was assisted by the God of Wealth.
When an assigned quest is fulfilled, the God of Wealth will have to give something that cost her something in return, and she actually complained when the rewards are too generous as her wealth is also the source of her strength.