The Negroni is experiencing a comeback. It can tend to be a little bit sweet, but the Campari keeps it under control. That said, in it's traditional mix, the Gin can get lost. Don't use your best Gin, but don't use cheap either.

Traditional measurements:

1 oz Gin
1 oz Campari
1 oz Sweet Vermouth

Garnish with orange that is squeezed into the drink before drinking. I rarely have that wheel of orange around. That little bit of orange is import. If I'm feeling impetuous, I use a splash of Angostura Orange Bitters. Otherwise a teaspoon of orange juice.

I find that adding a 1/2 of Gin helps create a better balance.