Google maps are shit. They've just taken the imagery from Google Earth, traced out the streets (most of them anyway, they've missed quite a lot) and then (allegedly) stolen the street names from another mapping company. There's no detail on their maps - no building names, no landmarks; just street outlines and their names. It doesn't even mark the Brandenburg Gate or the Reichstag!
The best maps are
Hot Maps, although they don't yet cover the whole of Germany unfortunately. Nor is their Berlin map as good as for
Munich, for example; the latter one is fully scrollable and with a good search function.
See also an
earlier rant by me on this subject.