Are Bowers and Wilkins speakers overpriced?

Yes they are overpriced. All speakers are. 

In my mind they are quirky. Each generation / model has different target curves. Some of the bad rap may be that they may be designed to be listened on mid axis instead of tweeter axis. Some has to do with their voicing which is designed to stand out.

One positive thing I will say is they’ve taken to using higher end caps in their crossovers, which a lot of high end makers skimp on.

Before I get any flames, please, buy B&W if you like them, or any other brand, I don't care. Enjoy what you buy.

804D3 owner. These are the best speakers I've ever owned. They are to large scale music what IMAX is to cinema. The have phenomenal dynamic range, speed and impact. They are strong in the sense they remain composed no matter what chaos is happening in the music. They do need subwoofer support to be full range. To me, this is their only short coming. Very balanced and natural sound (with equally adept partnering electronics and cables). I think they're worth the cost.

Overpriced?
You're in the wrong hobby. Asking for a stamp of approval on something YOU like, isn't a good sign.

If you love your 805D3, then it shouldn’t matter what others think of the brand unless you are second guessing your purchase.

IMO, they are not overpriced. I’ve enjoyed B&W speakers for 15 plus years, they are wonderful sounding speakers, well designed and built.

Enjoy!