It is if you don't know the reasons for the Apple/Google split.
If Apple needed/wanted to build their own mapping system (regardless of the reasons for doing so) it would never be as polished and "ready" as Google Maps UNTIL it had spent time in the hands of hundreds of millions of iOS users.
Now whether or not you think Apple should have ditched Google is another question. Since no one knows (except Google and Apple) the nature of their contract and why Apple decided to go its own way, I don't think its fair to bash Apple over taking control of one of the more important aspects of its OS.
From what I've read (and it seems entirely plausible), Google wouldn't allow Apple to use the data for certain things - though Apple built the app itself - such as turn-by-turn as to give the Android offering a competitive advantage. If that is the case (which I wouldn't fault Google for at all given their goal is to push Android and NOT iOS) then why would Apple continue to pay Google for data for a half-baked app that didn't have the functionality they wanted it to have?
Good post jrswizzle:
There is also much more involved with the Apple, Google relationship, Google wanted Apple user data so badly they could taste it and Apple told them to pound salt, Apple is a hardware and software maker, where Google sells advertising, if Google could find out what time I take a crap at, which hand I wipe with and what brand of toilet paper I use, they would get on it (and I assume their working on it).
I have read many of Googles End User Agreements, and I was amazed at how intrusive they want to be, Google wants to know, where your going, where you've been, how long you've been stopped somewhere, what did you buy, the list goes on and on, sure Google offers services for free, but there is no such thing as something for free except a STD, and you still have a choice to prevent a STD.
Apple most likely wants some advertising bucks also, but they have had some class by keeping the intrusion levels low, and the free software Apple offers, is also not free, each and every Apple product user has paid for the service or software offered, I have yet to do a full reading of the EULA in iOS 6 involving Facebook and Twitter (I wonder whats hidden there), when somebody says "there is no such thing as privacy anymore", your listening to someone who has given in to this crap.