I don't thing the Berlin scene per se is "Mickey Mouse" but there are a lot of companies that grew to fast with a insane amount of money. A lot of times the founders were installed as CEO and had little to none experience regarding leading a business. The were just happy to "make it" but had no clear vision what happens after the big money came in.
Same for SC: They got a lot of money for a good idea (democratising music I would call it) but there was no clear vision or business model for the future just like OP calls it out. Some goes for a lot of other companies we've seen come and go.
In the end Berlin is just not as mature as the valley but this is changing lately at least from what I see