Thats the tricky part isnt it?
To even get consensus about what "done well" mean.
Much more important is the matching of 5e mechanics - shove, concentration, surface/grenades, healing, items, spells, etc. Again, homebrew mechanics changes can be done correctly while preserving balance...but again it's important to consider what effects such changes will have on other aspects of the game. And changing a single mechanic will have a vastly greater effect on gameplay than changing a single monster.
Agreed ...
But that would require much more specific suggestions than "please give us DnD mode". :-/
