I don't have a direct link, no. But it was stated in many DAI pre-release interviews where they continually acknowledged DA2 as a kind failed experiment.
Actually, here's one where it's discussed.
http://gamerant.com/...sition-romance/
Pfft, a failed experiment my ass. It was the blatent rush job, dev's denial, wtf orsino moment, that made most people mad. DA2 did not completely fail,: people liked the characters, most of the story, humerous Hawke, and ect.
They should just come out and admit that they did a half-assed job, and thought people wouldn't notice. It backfired on them, and long term sales suffered.
Ultimatly the fault was with Bioware/EA and not the games concept, or characters.