Yahoo's stock price hasn't been crushed, unless you're comparing to 2000; in the last 10 years (because it's conveniently available), it's up 33% vs s&p500 up 66%. Not good, but hardly crushed like say Blucora (formerly Infospace), down 53% over the same time period.
But it is "crushed" if you consider that during the same time by putting your money into an index fund, you would have twice the return on your money with nowhere near the volatility. Getting half the return and twice the drama is kind of crappy.