I have a different take....

I don't really care that they all look alike as long as the sites usable to me for its intended purposes. Honestly, having each site have its own brand is annoying to me.

For years of dealing with badly designed sites, I wished then that they _copy_ a better design even if it looked generic. Even copying a simple but usable design would have made many sites easier to use.

I don't want the site to win an art contest, I want the information to make a decision. At a min just be easy in the eyes and intuitive to use and get the info.