Creating cocktails with strong, complex flavors can be a bit of a balancing act. Much like food pairings with wine, you have to make sure that if you plan to use strong flavors, those flavors need to stand equally on their own but also should not overpower or (especially) not be overpowered by another ingredient in the cocktail.
Campari® is one of those unique flavors that people either 'get' or dislike completely, similar to peoples reaction to cilantro (love or hate). It is a shame too because Campari® has a beautifully complex bitter-sweet flavor combination that is almost indescribable. It can make the ordinary exquisite and extraordinary even more unique and amazing.