What probably happened is the skills were OP like 2days before live, so they decided to nerf them last minute, and this is the result. And they either forgot blade flurry, or everyone was playing the other 2 so they didn't notice Blade flurry was also OP because it was less OP so it wasn't nerfed.
But yeah the current result looks really bad. Scorch is like pretty fucking bad, but Blight is quite possibly the worst skill that's ever been in the game, including shit like Puncture, various states of Viper Strike, prebuff Arc, Elemental Hit and all other shit skills there's been. It can't be scaled with poison, can't leech, can't crit, aoe is shit, range is shit, it's channeled AND it does absolute trash damage, at every level, both when you get it and at endgame(based on what people have shown mind you), it's a disgrace for the QA team. You could literally double the damage and it'd still be trash. Meanwhile Flurry is like twice as good as any other melee skill, in large part because it's "melee" and not actual melee, but also because it just does twice the damage of everything else too for some reason.
Still nice they patched shit before the season, especially the whole have to rollback and fix shit cause literally no one can move in the game. That would have been a monumental clusterfuck for a new season launch.