What specifically is ugly?

Edit: I'm a developer. I'm literally asking so it can get addressed. I've actually had a look at the defaults and I can see a few issues that look like they should be reviewed, but I'm interested in what is considered a show stopper.

It's all very well to complain that something is "ugly", but it's so subjective that it can't be actioned in any way. If the point was to just complain, I suppose that's one thing you can do, but if you would like to make something less ugly you need to actually be more specific.