He has very good AA abilities (however, cross over jump kick beats his D1 anti cross up), high damage, and endless vortex set-ups. And D4~takedown I suppose.
However, Scorpion's huge problems come from initiating those advantages in the first place. Let's not forget that more often than not when he does get his bullshit started, the opponent has a breaker on hand or, you know, just guesses right.
I don't think Scorpion is as bad as most people say, but I still think he belongs near the bottom of the mid-tier. He's still viable, but don't overrate him.