It's a bit the architecture of the 60s in general, universally hated in germany. But I find the optimism and futurism very interesting. The often neglected facades have something tragic, like a broken promise of a future straight out of comic-books.
There are definitily bad examples, but I define them by being boring, not brutalist. I think it's an interesting expression of a epoch that's worth preserving and also complements the architecture of the city. Of course, you don't have to preserve everything.
I think the difference is that I don't think a building has to be good or pleasant looking for me to like it (not that there are not example of good/pleasant looking brutalist buildings!).