Saesee Tinn

First of all, Saesee Tinn's name was really Saesee Tiin.

... Plot twist, yeah.

Tiin was famous for being able to fly really really nice starships really really slowly. Some say he took quiet satisfaction in forcing obnoxious drivers behind him into doing the speed limit on Coruscant. Others claim he just had really sucky vision.

However, Tiin's greatest accomplishment came in his final duel, the would-be stacked 4 vs. 1 match-up with Darth Sidious. Unfortunately, Tiin proved that he really DID just have sucky vision, because he failed to see Darth Sidious lunging for him over a span of about 25 seconds. Without realizing any imminent need to, oh, I don't know, maybe execute a basic lightsaber parry, Tiin was promptly killed by the Sith lord. Fortunately, unlike fellow Jedi failures Kolar and Fisto, Tiin did not utter a nonsensical one-liner from his dying place on the chancellor's floor.