As opposed to those bad SONIC cartoons from the nineties that people here like to rave about? You should actually watch at least some of the newer cartoons to really make a judgement. In any case there hasn't been a great Sega adaption in film, TV and anime although that YAKUZA spin off KUROHYO TV series was quite well done. I just get it because i'm a collector of all things Sega and i can afford it. Out of the animes that i really enjoyed was the SONIC OAV, VF and the SAKURA TAISEN tv anime series. But the newer ones wasn't too bad either, BAKUGAN and DINOSAUR KING was pretty dark towards the end of their runs for that type of inspired Pokemon show.
Hey, Sonic SatAM was an awesome kids show in the 90s! Hasn't aged all that well, but most 90s animations haven't, aside from Gargoyles and some Warner Brothers classics. I think a lot of love for many of the cartoons from back then stems from nostalgia, and I'll be the first to admit that that's probably one the reasons why I still like SatAm XD.
I tried watching Bakugan a few times long ago and I found it quite painful. How dark it is doesn't really concern me: I just found the story to be incredibly lacking and the voice acting to be terrible.
I actually got Sakura Wars on DVD recently. Dub hasn't aged all that well, but it's something I really want to check out when I have the time. Only seen the first episode so far and it didn't really grab me, but most anime tends to take few episodes to get going.
Aside from Sonic stuff, what SEGA media would you recommend? Should I check out Virtua Fighter?