Versatility - In reality, Set can be played as a Mid, Jungle, ADC, and a Solo laner with ease. Escape/Engage Potential - Sandstorm can easily get you where you want to be as it's essentially a free combat blink, giving you minor protections and immunity to slows. Being able to heal and do massive amounts of burst to the enemy is a sure fire way of wreaking havoc on the battlefield. Good Mid-Fight Sustain - Kingslayer is a vital tool for Set's carnage upon the enemy backline.
Good Secure/Steal potential - Skewer+ Spawn of Set can easily secure or steal an objective with proper timing and it's a fast and heavy hitting combo. Insane poke - Set's Skewer+ Spawn of Set combo is RIDICULOUS damage output late game being able to half hit mostly any squishy in contact.