Yep, HItler was a frustrated, no talent artist, but both him and Hubbard learn how to manipulate people in the extreme.
Hubbard was not second rate!
Anglo-Hungariona writer George Mikes once wrote that he wished he was second-rate, but considered himself (perhaps conceitedly) fourteenth rate.
His point was: If Homer, Tolstoy, Balzxac, Dickens, Sophoceles, Shakespeare, Goethe, Keats are first rate, then Flaubert, Proust, Byron are second rate.
Thackeray is third rate, Joseph Conrad is fourth rate, and do on.
And a tenth rate writer is still a giant in the field.
That is worthy of being a tagline. Excellent.