I think Sega and a lot of game companies for that matter need to consider the maxim "The Customer Is Always Right". I think that like with a lot of other things in the gaming industry we're looking at an increasingly corperate culture basically punching in a bunch of numbers based on their research and then deciding what the perfect game is, and if we don't like it, obviously there is something wrong with those doing the complaining.
The truth remains that corperations have always been especially bad at the actual creative process itself, I think the gaming industry which is based on creativity has been suffering to some extent as a whole because of it's insistance on becoming increasingly corperate and statistic driven to make more money.
I usually consider it a bad sign whenever a developer or even a producer decides to claim their fans are somehow at fault for a bad product. Even with movies "we overestimated the audience, obviously people are too dumb" seems to be an increasing reflex. Of course then again I suppose trying to cater to the mainstream and that ultra-low common human denominator is also at fault. I mean what would have been a success if targeting a regular sized, or niche, audience can be failure if your predicting (and requiring) something to see millions upon millions of sales and turn into a cultural phenomena.
I'll also be honest in saying the same thing I did about the latest "Final Fantasy" game: We are currently using the current generation of technology because it's supposed to be better than the stuff we left behind. If the current tech can't do things that were previously common, like detailed city/world building in RPGs, or producing a good Sonic game that meets the expectations of the long-term fans, then the current tech is hardly an improvement. It's the job of the industry to get itself together and make things work, not give the fanbase excuses. If a company can't perform reasonably at the current level, then they should go back a generation and design more for the PS-2 and X-box (currently a lot of units out there) or whatever.
While this is getting somewhat off subject, I'm rapidly beginning to think of the Wii/PS-3/360 era as being the gaming "age of corperate whining" more than anything. Oh sure we see some decent stuff, but for every genuinely awesome game released that wows the audience we seem to see two designers making excuses for why their current work can't be as awesome as their previous work because of "limitations on the current, more advanced, technology" which is supposed to be better. My attitude is basically that they need to put their nose to the grind stone and find a way to make the things us consumers want, or get out of the business, instead of crying "OMG, we can't do that" or acting like the audience are stupid or retarded for expecting things that could have been accomplished a generation of tech ago (or even two) with current, much more powerful technology.
Such are my thoughts and opinions. The bottom line is that Sega and Team Sonic have nobody to blame for their poor reception except for themselves. It's our job to tell them when a game is good, as we are the ones paying for it, it's not their job to dictate it to us.