A related quote on damaging reputations from Dark Shikari:
"Xiph [is disliked because of] the methods that Xiph uses to market their bad technology. They have at times posted outright lies about their software and then, once proven wrong, often refuse to recant. Example: the Theora vs x264 PSNR comparison where they "accidentally" performed measurement wrong, making x264 appear 2x worse.
They use the same techniques as many of the more evil commercial companies out there, which annoys the hell out of people who disagree with such techniques. ffmpeg devs believe that open source should be about honesty and good technology, not lies and FUD. Xiph disagrees, believing that "the ends justify the means", creating a practically unbridgeable gulf.
Thus Xiph has spent the last few years spreading absurd amounts of FUD about everyone who they believe opposes them."
It appears the shoe is on the other foot now that the discussion has moved from quality to patents and his own project looks to come off worst. He's posted minor updates to his piece about certain patent areas he commented on, but his conclusions still stand uncorrected and I think you'll find his words quoted all across the internet on the patent situation with regards to VP8, something which he clearly isn't an expert on.