DBZ and Sonic aren't similar enough to copy-paste
Concept:
A tribution toTOONAMI, Sonic, and DBZ by copying the epic TOONAMI promo style featuring DBZ but replacing the DBZ characters with sonic characters.
Aesthetic:
Even though it was based off DBZ I think you should've kept the characters at their original size and not base each characters size in relation to their DBZ counterparts. Otherwise the drawing was well done and the sonic characters replicate their original design. Wouldn't exactly be Dbz, or Sonic for that matter, without good use of vibrant colors, tints and shades, so good job there.
Animation:
Didn't really like the execution, and was disappointed with the lack of originality. Judging by the title I was expecting A more original sonic promo with toonami's flare. Dbz sonic crossovers are always typical, with a few exceptions. and no offense but this one isn't really anything special.
The voice overs felt way off (especially Metal Sonic having Frieza's voice.) I think some other voice actors from this website would've been more appropriate. Or maybe some existing dialogue from the video games would've been easier and still more appropriate. You still would have successfully replicated the promo since the DBZ action will still be there while having the voice more loyal to the Sonic franchise. Making the cross over more sensible and more than just a DBZ promo with disproportionate Sonic characters thrown in for the sake of it.
The animation was successful in recapturing the anime bits in the original DBZ season 4 promo, so good job there.
Overall:
A successful promo that will satisfy your nostalgia if the awkward execution doesn't distract you. From where I sit it does a good enough job honoring a classic anime, a great video game franchise (fan-base aside), and a long missed action-cartoon block That made the golden era of Cartoon Network.
3/5