Forget the center in Berlin, I went through in 10 minutes.
It only took that long cos it took me one minute to get downstairs (it's "underground"), 8 minutes to take pictures of the miniland (which is a miniture Berlin - nice, but "just" another miniland), and another minute to look around the store with a small PaB and no sales.
The center is a check-in, a small miniland, a few tables for kids to build stuff, a small food court (very small, right next to the building tables), a small dragon ride, a small theater with the same movies as in the LEGOLAND parks and a store. All underground, so no loopings or anything for the ride (it looked like it went in a circle anyway, dunno, I didn't go).
At least they let me in for free with the LEGOLAND annual pass I got in G