Any measurement system that requires you to use decimals for reasonable accuracy in common situations is the wrong increment and if this is common when using the measurement it's just a bad system for that reason.
For example, measuring the height of a human being requires the use of feet and Inches in Imperial measurements but generally uses nice clean numbers in centimeters for the same accuracy. This occurs frequently for certain measurement cases where cm/mm are better, but there are just as many situations where foot makes a cleaner measurement than meters. Outside small measurements and between large ones the foot is a cleaner measurement in my opinion.
For temperature, centigrade is too large of a measurement, at least for temperatures humans encounter on a routine basis. Decimals in centigrade are needed to provide enough accuracy. This isn't true of Fahrenheit, daily measurements, food, etc where F is a cleaner measurement in whole numbers. Centigrade is a scientific temperature scale, it's great for that, it's lousy in daily use.
It's unfortunate that SI was based on the old French meter, it's just too big in general use, something smaller close to a foot would have been better then we wouldn't have ended up with a worthless deci/deca meter. Centigrade is the same, in looking for a cleaner measurement they used boiling water as the high end which made the unit too large for common use but great for scientific measurements.