"The one show that got everything correct." Eh?
Not to seem intrusive, but not everything in the show was perfect. Some character portrayals got worse as the series went on (succumbing to Flanderization), some plots went nowhere, and some ideas weren't implemented well into the series. While I admire the effort and dedication put into the series' direction by its creators, it isn't as perfect as most claim it to be. Not to mention the show is somewhat dated by today's standards.
That's not to say I dislike the series. In fact, I enjoy the series full-heartedly; but even I will admit its flawed in its directions. I like the the series so much, I acknowledge and put up with its problems whenever I watch it.
Also, I'm getting pretty sick of the whole "Sonic isn't for kids" argument. Many fans were kids when they first watched the series because they were in the target demographic at that time. But as time passes by, we grow up and our perspective of the world changes. And oftentimes, the shows we grew up with get dated because we're no longer within the age of the target demographic. And honestly, I wish people would stop calling family shows/movies "adult" because that's not what they're targeted primarily towards. Shows and movies like those are meant to attract audiences of all ages; and throw in everything those demographics find enjoyable. For example, compare something like "Care Bears" or "Die Hard" with something like one of the many Pixar films. "Care Bears" and "Die Hard" have aspects that pander towards specific age demographics which the other won't find appealing; whereas Pixar films have colorful characters, gags, and lessons to entertain/educate children, some jokes and profound themes for adults to ponder over, and scenes for the elderly to enjoy (whichever that is). Now THAT'S a definitive family movie.
With that in mind, SatAM is definitely a darker series compared to something like AoStH or "Sonic X" (in some aspects). But what makes it appealing, even by today, is its wider target demographic. It takes itself more seriously and had profound lessons, but also has enough fantasy/sci-fi surrealism, colorful characters, and humor to entertain younger watchers. That, by all means, makes it a family series.