It could also not be his fault as there are writers, directors and even the co-stars that can affect the whole production.
The porn actors are the attraction and center peace of the film while in regular film something like 2001 a space Odyssey the actors are simply just a medium in which to view the film from almost or in Nicolas Rhefen movies the actor isn't tasked with much the real attraction is the atmosphere that is created by the cinematography.
These pornstars they seems to be paid to twiddle their dicks but it's not an easy job, man.