Shadow and seeing what he's about, I'm happy to say he's wonderful character to play, and takes more simple approach like The Werehog and Silver.
Chaos Snap is great you can use it get up in high places and push yourself forward to, it's a little slippery but I think that was point it's a con of the move that keeps it from being OP so you can't spam it without a little risk, so it promotes smart usage of it.
Homing attack is also mapped to the same button as Chaos snap and will activate when locked onto an enemy good thing about it is that shadow maintains some of his momentum off of his homing attack chains so it's not a pace breaker.
Shadow was a character I was waiting on for a bit, and I was always wondering how he would turn out, because if think about Shadow doesn't have many moves that compliment going fast, like Chaos Blast would be cool and all, but how useful would it be in this type of game?
Some people seem to be upset he doesn't have more moves, but like before a lot of his moves really don't lend much for this game, and the one's he does have are basically the things Modern Sonic has, and Shadow doesn't need to be Modern Sonic clone, the way Shadow was made gives him his own identity amongst the other addons.
But as any reading can tell I'm pretty satisfied with this incarnation of shadow in SRB2.