It is really not 1/3 the quality. It has errors, without question, but so did Google Maps when it first launched. To partner with another company and then, in a few years again switch to their own maps and start over or partner again with yet another company doesn't make sense.
It's an unfortunate situation, but not something that can't be gradually fixed. There are several features I prefer actually. The city I live in is broken into subdivisions I wasn't previously aware of. It looks nicer. And the yelp reviews are useful, perhaps even a good way for businesses to quickly become featured on maps.
I have to be honest, none of the people I know who have purchased the 5 have complained much about maps, they realize its not as good as google but they feel the other features more than make up for it.