I am amused that their graphical representation of the Android version customized for a particular model of phone is "Android mascot dressed up in a really cool spacesuit looking thing" and not "Android mascot with bags of trash stapled haphazardly to him," which would probably be more accurate.
Some of them are actually rather nice, I really enjoy OxygenOS for example (the vendor OS for OnePlus phones). It just seems that a lot of the awful OS' are delivered by the larger companies.