I guess relative to some other lying, thieving, murdering and utterly lacking any morals gangsters, yeah he was a bullshitter. However, compared to real stand up men like Rick Rescorla, Stephen Stiller or any man who puts in an honest days work, they're all a bunch of bullshitters who brought decades of misery on generations of New Yorkers for their own profit, so they're all full of shit in my book..
"Senators, we're both part of the same hypocrisy but never think it applies to my family"
-Michael Corleone