Exactly. The same goes with YouTube. Google rolls out better web versions faster than Apple can keep up with the apps. It makes sense, though.
To be honest, I find the web versions of these sites work great on iPhone. Try saving maps.google.com as a shortcut on your iDevice, same with YouTube (if you use it).
Luckily for me, the default maps app does everything I need it to do. As I just use it to look up locations quick.