User blog comment:Muffintehbrony/Unseen 'unviable' champs/@comment-4714821-20140324150619

I would say Viktor isn't used so much because while he is a very destructive burst mage there are other burst APCs that produce the same results with much less execution skill (Veigar, LeBlanc, etc.). I would argue it's the same for Talon; why play Talon when you can just play Yasuo and have just as much burst potential (sometimes more, since Yasuo has barely any cooldowns whereas Talon has 4 fairly long CDs).