The chases are good - especially the 10-combo ignite - but with my fire team I can shut him down whenever he tries to put up the barrier. For me the most lethal thing about him is paralyze.
People say he's good with lightning teams but if you use lightning's second (AOE) mystery Sasuke's a little redundant, in my opinion.
He's good against heal teams because of ignite but bad against heal teams because of the squishy.