While I don't care about Sonic Boom at all, I would like to remind you that using stock characters is a something Sonic has always done, and even the things that people like do it. Sonic is the standard hero trope, Tails is a gimmicky engineer with a complex for his hero, Knuckles is the stupid bruiser, and Amy is hopelessly in love with someone who doesn't care. That was true even in the classics, and as time as gone on it's gotten even more obvious. If you're making a television show like Sonic Boom, though, you're going to need more cast than just that, so they have to add some side characters. Using stock character designs is the easiest way to do that, and if you remember SatAM, you might remember that basically the entire side cast was filled with tropes and stereotypes. A cowardly Frenchman? Sure, that's original! People like SatAM regardless, because side characters really don't need to be original to work.
Now, whether this will be rubbish or not is still up in the air (I'm voting there's no way it's good) but I wouldn't discount them just because they're using simple stock characters to fill out a side cast lineup. That's just common behavior, and it works even in very well-done things.