I'll give a basic summary in case you're too lazy to read the articles. Someone asked David Brevik, the creator of the Diablo series, what his thoughts were on the Diablo 3. He went on to (politely) give his thoughts on some of the choices made for Diablo 3 and believed that the fans disappointment with the game shows how important the original team that developed Diablo 1 and 2 were to it's success.
Some (not all) of the developers of Diablo 3 were not happy with this. Apparently they're perfectly fine with random people online calling their game shit, but god forbid the creator of the damn series express his disappointment with the direction they took in a mature and professional manner.
I'm not even a huge fan of the Diablo series, but I can sympathize with the people who are. Fans waited over ten years to get a worthy sequel and ended up with Diablo 3. If it were one of my favorite series, especially one from my childhood, I'd be pissed off too. Lucky for me Final Fantasy, Mass Effect, Dragon Age, Castlevania, Turok, Banjo Kazooie, Crash Bandicoot, Fable, and Star Wars: KotOR don't have disappointing sequels that bastardized the previous games, right? (Hint: http://www.youtube.com/watch?v=K53lhTgfppw#t=00m36s)
It's like having the creator of the Final Fantasy series give his thoughts on why most fans weren't happy with FFXIII, then having the developers of FFXIII bitch about it and talking shit about his work outside the series. Any fans of Diablo have thoughts on this?