Well, only the default gui sucks, I think that are lots of guis around the net thta work quite well - and the ability to set the gui exactly like it is good. I for one think that navit looks much better than anything [graphically] based on Google maps.

In a way, this could be a distribution job to provide a sane configuration, all that is needed (the include mechanism) is pretty much in place judging from my experience and the thread linked.