Well, the capitalization is not as bad as the fact that it's kWh (kilowatthours/Kilowattstunden), not kWh⁻¹ or kW/h (kilowatts per hour/Kilowatts pro Stunde). It's a measure of energy so it goes up as power is consumed (or generated or whatever) over time, not the other way around!

The capitalization is not as important here but sometimes, it absolutely is - mΩ is 10⁻³ Ω while MΩ is 10⁶ Ω - a billion (Milliarde) times more, or data units like Mb (megabit) and MB (megabyte) where one is 8x larger than the other. Sometimes, the people inventing units made really stupid decision, like 1 Cal = 1 kcal = 1000 cal, with both "Cal" and "cal" being called "calorie". It's almost as bad as "a billion" (American, recently also British English) = 10⁹ vs. ein Billion (German) = 10¹².

However, I still think that capitalization is very important for all units, if only to show non-metric plebs the superior status of our standards. We have rules while they use MPH/mph and PSI/psi interchangeably.
This reminds me – they denote "per" as another letter (MPH = miles per hour) or, unacceptably, not at all (PSI = pound forces per square inch). We denote inverse relationships like mathematicians, with fractions (slashes) and exponents. The ridiculous aforementioned offenders should be written "mi/h" and "lbf/in²". Just imagine atrocities like this in metric, how does "going 60 kph on a 50cc bike" feel instead of the correct "km/h" and "cm³"?

In short, we should be respectful to the people who made a better system than the alternative by following the good standards to ensure continued ease of use, error resilience and language independence of our system.

unit ÷ h

I thought Germans used the : symbol for division, like us Czechs.

Encore rant for all the upvotes:

All this kWh and Cal nonsense could have been avoided if we just used the SI unit "joule" and its multiples for all energy, which is one of my few metric system woes. Still, a factor of 3600 is better than 5280 feet in a mile, and imperial people have their own mess with energy units (kWh, Cal but also BTU, gallons-of-gasoline-equivalent and horsepowerdays or whatever). They can't even get distance measurements to convert easily: you might remember 5280 but can you recall and apply the inverse logarithmic formula to convert between AWG and inches??

It's not by me; Nayuki is a very cool person. She made a cool PNG chunk analyzer on her website too, and has some interesting blog posts.

As for the length: Well, I don't actually mind some of the featured items but I find at least 3 particularly annoying.