The disappointment comes from the deliberate focus on Cook's sexuality. First off, who gives a crap? Second, what does it matter? And finally, why go out of the way to escalate this speculation all they into the article's title? Allow me to take an educated guess on the first two: nobody (aside from a bigoted minority) and nothing.
That the leaves the third question. Why has Gizmodo put the spotlight on such insignificant speculation? It's tempting to call this retribution for Apple leaving them out of the Verizon iPhone announcement, but that's doubtful considering this similarly themed article from 2008. This is more likely a tasteless, if not misguided, act from a site that is not afraid to sensationalize even at the expense of marring it's own otherwise well-written content.
Source:
http://gawker.com/5736917/meet-apples-new-boss-the-most-powerful-gay-man-in-silicon-valley
http://valleywag.gawker.com/5082473/is-apple-coo-tim-cook-gay