Yes or no?
No
No, but he may be one of the most important of all time.
It is impossible to say, martial arts are, by nature, filled with bullshit stories and unprovable stories, but Royce is the most influential martial artist on the martial arts. Bruce is the most influential on the world as a whole.
He was the right person, at the right moment, at the right place.......
He changed the history of the martial arts. Maybe not the best fighter but definatly one of the biggest names in Martial arts 20th century history.......
Are the Gracie's the best marketers of Martial arts? Quite possibly. 
- Bruce Lee 2. Rickson Gracie 3. Red Power Ranger
How is it no one ever mentions Jigoro Kano on lists of influential martial artists?
Maybe not the best, but he revolutionized martial arts in a way that no one else had in hundreds of years. He is the single most important martial artist in the last 100 years.
Frank Dux
no.
Definitely not of all time.
He introduced BJJ to the mass audience though and opened a lot of peoples eyes.
lol ... no.
absoluteidiot - 1. Bruce Lee 2. Rickson Gracie 3. Red Power Ranger <img src="/images/phone/post_tag.png" alt="Phone Post" border="0" style="vertical-align:middle;"/>
obvious joke is obvious but i still lol'd
BigRay - No, but he may be one of the most important of all time.
BigRay - No, but he may be one of the most important of all time.
This.
This one is easy....the greatest martial artist of all time is this man....
Who else has all the credentials of this man?
Royce was in the right place at the right time. He may have beaten everyone put in front of him in those first few UFCs, but Rickson would have eviscerated them.
one of the most important martial artist in the modern era for sure. but he was at the right place at the right time. Any BJJ guy could've been in the first few UFCs and whooped. it only took a few years for the japanese to relearn their old tools to whoop on the gracies. I believe renzo was beaten by tamura in the mid 90's.
Bruce, Kano etc. are more important. I'd put sakuraba up there as well.
Royce is a legend, but not even close to the "greatest". Kano, Oyama, Lee; all bigger. Guy's like Funakoshi and Ueshiba were influential too. Then there's the American MA pioneers; guys like Ed Parker, Norris, Lewis, etc.
Kneeblock - 5) Choi Hong Hi <img src="/images/phone/post_tag.png" alt="Phone Post" border="0" style="vertical-align:middle;"/>
No. He was a part of it, but you can't really credit the spread and popularity of TKD to any one guy. In fact, it was GI's coming back from there and TKD's later addition to the Olympics that really popularized it. Choi took all the credit, though. That's for sure!