Sorry. I've used Gnome, Unity, and KDE extensively. There is an incredible amount of work that goes into them sure but they are definitely not polished.
I'm the definition of UnixPorn junkie and customize my linux box to the hilt but even I have to admit when there is a benefit of standardization and the work the elementary people are doing.
Because otherwise I can just proclaim that GNOME, Unity and KDE are polished and then we're at opinion vs. opinion.
I mean, I don't even really think that Unity is terribly polished, but someone else might (e.g. the commenter you replied to), and then your opinion is not any better than their opinion.
I'm not sure what you mean by polish. Is it perfect? No. Is it better than say OS X and stays much more out of your way? For me GNOME 3 does a much better job than OS X.
I'm the definition of UnixPorn junkie and customize my linux box to the hilt but even I have to admit when there is a benefit of standardization and the work the elementary people are doing.