I'm happy with metric generally speaking - except for Celsius when talking about ambient temperature. I will die on that hill. Freezing/boiling point of water is a ridiculous point of reference for temperature as experienced by humans.
Fahrenheit: 0 = really cold; 100 = really hot
Celsius: -17.778 = really cold; 38.333 = really hot
Not to mention that the Celsius grading is too big requiring use of tenths when discussing weather and setting a thermostat...