Sorry to join this thread late, been packing and moving all day...
There are several reasons for Griffith's obscurity, and Bob's already mentioned most of them. First of all, most of his best features were made a Paramount. Many of them are lost, and Paramount has not released any of them on VHS or DVD.
The survival rate of Griffith's shorts is really bad, only a handful of films from his Sennett and Triangle Komedy period survive. He started his career at Vitagraph, but I have not been able to find any films where he appeared there.
Griffith played supporting parts in features for several years when he left Sennett. He appeared in quite a few supporting dramatic roles in the early 1920s. So while many of his features are lost, some of them are just smaller parts.
When Walter Kerr wrote
The Silent Clowns, he included a chapter on Griffith even though he could only see a few of Griffith's features.
Griffith's reputation rests mostly on
Paths to Paradise and
Hands Up!, but he has several other really good films that are still around. Although he probably doesn't appear for 10 minutes in
Open All Night, he definitely livens up the film.
He lost his voice as a child from diptheria. And although sound killed his career, he was already making quite a bit of money doctoring scripts for comedy films. Paramount was not exactly the best studio to be making feature comedies during the twenties, as Roscoe Arbuckle and W.C. Fields discovered. The studio wanted to crank them out as fast as possible, and the quality could suffer. So Griffith broke his contract with Adolph Zukor in 1927 to strike out on his own.
I wrote an article a few years ago on Griffith for Classic Images. You can read it
here, as well as browse through my Raymond Griffith photo collection.
Annette DeFoe and Griffith in
An Aerial Joyride, which still exists.
Alice Lake, Lionel Belmore, Raymond Griffith, George Reed, and Marie Prevost in
Red Lights (1923), which still exists.
Raymond Griffith and Virgina Lee Corbin in
Hands Up! (1926)
Raymond Griffith, former comedy star and now an associate producer for 20th Century-Fox, discusses a portrait sitting with Simone Simon, who makes her American film debut in "Girls' Dormitory", which Griffith is handling. (1936)