100 is pretty hot, and 0 is pretty cold
Well, only if you live in the US mid-west. I'm used to 25C (77F) being quite warm and 30C (86F) is hot. I agree that -20C (-4F) is pretty cool, but it's not really cold until it passes -30C (-22F).
It is all fine and dandy to have a scale that 'makes sense for people', but when 'people' are a small sub-set who live in a particular climate then it really doesn't make sense for those of us who are used to different temperature ranges. Consistency and comprehension are more important, and it doesn't take very long to convert and begin understanding a new system.
In terms of smaller degrees, in Fahrenheit they are terribly useless and confusing. When determining what kind of day it is going to be and how I should dress I only care about 5 degree increments... in C, which is almost 10 degree increments in F. I really don't care if it is 14C or 17C both are 'close to 15C', much like it is of no importance whether it is 77F or 82F, it is simply 'close to 80F'.
Give me a consistent, useful measuring system that allows me to:
1) quickly translate numeric values into 'how it feels'
2) communicate temperature effectively with those around me
3) easily judge relative temperatures between different contexts (how hot is it if I set my oven to 60C? Not hot enough to boil, but more than enough to keep my food warm until I finish cooking)