It's not bad, but I'm not a fan of the skate boosting. The hovering just makes sense for Shadow as a character, always trying to one-up Sonic. Why would he use his legs when he can use his air shoes to fly? I get not everyone likes it, but this is why I personally prefer the hovering. Plus, the skate boosting just looks ridiculous with him flailing his arms around. Otherwise, I give this an 8/10
Personally I think it's the disconnect people have when seeing Shadow move fast while not putting any effort. Hovering is fine if he's going bonkers fast, but as a standard boost, it's boring to look at constantly. It's kinda why I liked the fast and jittery skating animations from Sonic Adventure 2, which shows that he's putting his all to gain his speed.