I'm English.
Pretty much everything I say can be interpreted at least two ways. I mean to be serious, it has always gently irked me that we would quote KwH when there is a perfectly good single SI unit "Joule" that does the job - but I am more than capable of multiplying numbers by 3,600 if I need to convert. II wuold like to know why we don't use Joules, KJ, MJ etc.
It's always bothered me that we quote batteries in mAh - like 2000mAh, which means I have to go find out what voltage it is before I know how much energy it actually can hold. But again, not a big problem.
On the subject of megajoules, I used to play pinball, and older machines would have scores that went up in units, or five points. Newer machines suffered from score escalation. Before you knew it, you'd only get a replay after scoring 100,000,000 points. Somehow they were more popular with people.