Doesn't that mean, that Monsanto and Bayer were both hopelessly overvalued by the time of the acquisition? I wonder which other company-valuations are overblown

Doesn't that mean, that Monsanto and Bayer were both hopelessly overvalued by the time of the acquisition? I wonder which other company-valuations are overblown only by the image a they have (cough ... facebook ... cough). Metrics beyond "observables" -- assets, infrastructure, patents -- seem to be impossible, when considering investments, i.e. how much of these values are pure speculation (?). On the other hand -- these lawsuits were also "observable", but not really "measurable".