I have a hard time understanding why more people complain about a possibly-unprofessional interview than they do about the hype campaigns and PR-dictated preview blowouts that drive so much of video game coverage even today.
molyneux puts a lot of himself out there in the interview, which it makes it easy to empathize with him as a person, then seeing a person be directly attacked in such a frank way is clearly going to set off people's sense of injustice.
hype campaign previews are a nuisance but they just wash over you and don't provoke the same visceral reaction. it's the accumulation that's the problem, but you don't see that day to day.