Darth Nihilus's need for a Touch Up!

The Jawas brought C3PO and R2 to Luke, causing his aunt and uncle to die, causing him to, rescue Princess Leia, blow up the 1st Death Star, make time for the rebels to escape hoth, beat Vader and cause the Emperor to die, start Kylo's reign of emo angst and bring the newest Skywalker to the galaxy, Rey (Not actually) Skywalker. 

So yeah you know what, screw the Jawas its their fault Rey exists. But in all seriousness, they were kinda the most influential side characters. The triumvirate actually did nothing major except for hunting down the remaining Jedi who were really already slaughtered by Malak so did they really accomplish much. Other than hounding the exile (1-2 fights each) they did nothing in KoTOR 2. A failed attack on Telos, killing the crew of a republic cruiser, in the past wiping out a race of blind people and wanting to (And subsequently failing to) rip the force a new one. 

The Triumvirate were not THE Sith. THE Sith were Revan and Malak. The triumvirate were just the sith in KoTOR 2. They were the sith when the sith were weak and working in the shadows. When the Jedi were also weak and working in the shadows.