The problem with using the metric system in the US is that it really isn't applicable to most real life situations and feels quite artificial. I recall having that feeling as a child while being taught the metric system.
It's funny that they show you the superb benefits of the metric system very early and when it is most apparant while doing basic arithmetic, yet you live in a country where regular use of the metric just can't happen.
I don't disagree that the metric system is simpler, but that's maybe not the best example, because the U.S. system has a similarly simple water volume-weight equivalence, and it even has a catchy saying: "A pint's a pound, the world around". :-)
It's funny that they show you the superb benefits of the metric system very early and when it is most apparant while doing basic arithmetic, yet you live in a country where regular use of the metric just can't happen.