To me Nokia was far sadder, it went from the top slot in the smartphone industry to virtually bankrupt in the space of one obviously malicious CEO. Whereas Yahoo was vapour valuation to less vapour in one obviously incompetent CEO.
And incompetent board. Don't forget the leadership before Elop was horrendously lacking. Sure Elop might well have been a Trojan Horse, but the only reason he could do what he did was because Nokia were in such a pisspoor state by the time he arrived. They'd squandered their lead and were so far behind the times, it's plausible that Windows Phone was their only option. A terrible one, but the chances of Meego having any chance in 2010 after iOS and Android had been running riot for 3 years was pretty slim. They were selling lots of phones but their trajectory was down.