Every personal site I've ever seen looks worse than Medium. I don't want the "character" of a slightly different UI every time, I want the interface to get out of my way so that I can get on with reading the actual content. Medium does that (yes, subject to logging in, but you can do that once and forget about it).
Different strokes for different folks I suppose, but rarely have I seen a personal site with a UI as obnoxious as Medium, I won't even click medium links on HN unless the content looks tremendously interesting. Especially as on most personal blogs if I'm only reading the linked article I don't have to engage with any of the UI, whereas with medium I have to dismiss the annoying modal dialogs.
On a related note, this is why when I search for a person, film, or other thing, I'll take the Wikipedia result every time over IMDB or some top ranking site. With Wikipedia, I know how the information will be formatted so I can find what I need quickly.
Man and I've never found much to like with the layout of Medium. The text is nice and big and that's about it. It gets as messy as any personal blog IMO.
I think its because of the ease of startup -- its essentially a good looking by default blog (as long as you ignore the paywalls, newsletter signups, "Join Medium" popups" etc) that is free and takes like a minute to get started with.
So people join, start publishing then realize its too much work to switch so they just continue using it.
I'm still a bit amazed that so many people, many of them who aren't short on visibility, chose to host their content on that site.
Most of it i would have rather read on someone's personal site as IMO that adds a lot of character and context.