On one hand he killed Qui-Gon on the other hand he lasted all of five minutes, was killed by a padawan and was not exactly well known after or before his death.
People often talk about Bane, Sidious, Vader, Revan when referring to Sith In-Universe but not Maul.
He was well trained in the use of a Lightsaber, but had a lack of intelligence and force power to be considered particularly great.
The death of a Jedi Master like Qui-Gon saves him from one star.
