Sonic fanbase is the most hated fanbase on the internet, for a good reason. LOL Seriously, who cares about man children anyways? I know there are decent sonic fans out there, I'm talking about the dark basement of the fanbase, so about 80% of the Sonic fanbase.
Also, I can understand critique of the character design, but death threats, or labeling of the entire game a failure? That's not something I would consider constructive criticism, lol not at all. Besides, I don't think that Sega cares about constructive criticism from the die-hard fans anyway, I mean why would they? It's not like sonic fanbase is huge enough, a very small percentage in the sales.