> Looks good: Doesn’t look like it was designed in 2008
Lucky us then, most DEs work on UI paradigms way older than 2008.
> Doesn’t break constantly: Doesn’t break constantly.
GNOME is well know for breaking often backwards compatibility, especially in regards to extension.
The only criteria which I'd thick next to de GNOME DE in consistency, would be: aversion to customization, opinionated, 80% done in perpetuity, and liberal use of space (low information density)