Do not marry this person solely to get a transient visa. Are you insane?
If you have a legitimate marriage, it would indeed put him in a better position for an IMMIGRANT visa.
However, a non-immigrant visa would be highly suspect being married to a US citizen. Whether it helps or hinders seems to be varied depending on who gets your application.
However it is not ever advisable to use fraudulent means (sham marriages or other) to get visas. When detected he'd looking at a world of hurt (bar from every entering the US).

