For me, the colour of the UI isn't really a problem, any more than Aperture's. The fact that it looks like it was designed by Kai Krause's less talented brother is another matter.
I fail to see how Color's interface would keep someone from doing their job. The only thing that needs changing is in functionality/stability. Wider codec support, better translation of the FCP timeline, simple effects translation (ie speed changes), stuff like that. Color's UI is functional... it does what it needs to.