What is the metric system worse at?
Just like who hexadecimal is very natural in 8/16/32/64 bit computing, the "real life" usage of measures would be much easier if it was in Base-12.
Three, I'll give you.
Useful amounts of precision is a nothing, if you ask me. We start teaching decimals in third grade, and the only real issue with decimals is weather, for which the difference is saying "80F vs 81F", or "26.7 versus 27.2", whose utility is ... limited.
For distance, the metric system has finer grained units for precision (come on, break down inches: 1/16, 1/8, 3/16, 1/4, 5/16, 3/8, 1/2, etc... are you going to argue that is better than 25.7cm or 257mm?).
I'm not really buying it, as someone who has lived in both worlds.
You can say 1.5 cups instead of 375 mL.