Grinding is a part of online games. Every online game has it. And you know what? Its fun.
You might disagree with the typical "hur dur is boring so i dont do it". That is just a childish vision. Much like a child vision of work.
When you grind, you are putting in hours and work to get what you want. I put in several hours, at least 5 straight hours in Violent Duct and it felt good after. Because I felt like I had earned my money.
However, the bug where you can bomb the coke/bomb the documents in rooftop rumble made it so ridiculousy easy that even I agree it should be removed.
Once removed, these missions would still take a minute or two. It would depend on your skill as a team to complete it fast.
And it would be incredibly fun.
TL;DR: Let us replay missions, but remove the destroying coke/document glitch.