Honestly, I have a hard time watching it, simply because of the excessively campy and cheesy feel. The same reason why I actually dislike Mania Adventures except with Underground, it's without the consistency and faithfulness to the original material.
The music isn't very good either, save aside the theme opening, you'd think the music quality would be on par with what came out a decade before, Jem and the Holograms, but instead sounds obviously rushed and Christian rock-y.
The characters never really hold tension with each other, either, they'll argue and not get along, but in the next scene they'll be yelling about "friendship! siblings forever!". Though, that is more on the fault of executive meddling. As for the characters themselves, the two main characters follow standard tropes, Sonia being the "icky icky dumb boys I love fashion" Sally-lite character [Ben Hurst's waifu], Sonic being "TOTALLY RAD! AWESOME!" slightly toned down version of his Satam self. Manic is the only character with an interesting concept, because he is something that isn't much seen in the series (or most Japanese video game series targeted to kids-teenage audiences) to begin with. The thief, the street rat, the 70's punk motif.. yeah, pretty underrated. If I could axe any character from the SU universe and keep Manic, I would do it. I have to wonder how this Manic character would be if he wasn't written as Sonic's brother.
The plot itself, stupid, I don't like the idea of triplet main characters. I don't like Sonic HAVING to be royalty either. Yeah, the whole development for this program was a fucking mess.