his opinions on Meyer's efforts: "DOA.".
YHOO was mostly "DOA" indeed when Mayer took over.
However, with her initial efforts in being overly meticulous with the redesigning of the logo (the 30 days of logos), the bombardment of press releases concerning their Weather app and her Flickr changes, there was proof she was overly (too much?) involved in new projects.
But then there was YHOO's Daily Fantasy product being released and that's when you knew Mayer had checked out and YHOO was dead under her leadership. In an industry that's raising 100s of millions in VC, YHOO was poised to potentially take over a multi-billion dollar market because of their unique position - YHOO already had a huge fantasy sports community, already had fully functioning real-time data feeds, the server infrastructure and the engineers to blow away the "frat boy" level technical efforts of FanDuel and DraftKings (FanDuel was storing user password in plaintext as recently as Dec 2014). YHOO could have undercut the "vig" so dramatically on their product and still been profitable and could have gained market share rapidly.
Instead, YHOO rolled out a half baked idea where users couldn't even select a username, basically stole the interface from FanDuel and they let the project rot most of the 2015 football season. Their product was seen as a colossal failure and was universally described as underwhelming. It wasn't built right from a technical perspective, it wasn't marketed properly and was built with zero consideration to the user. (Yes, you could argue that the current DFS legal landscape could be a reason for the poor development efforts, but the end result will be regulation, not banning.)
TL;DR - YHOO seems totally uninterested in putting in the requisite effort to make itself a technology company again under Mayer's leadership even when well positioned to assume control of a multi-billion dollar industry. All YHOO wants to be now is a company trying to avoid it's BABA tax burden.