I've never seen "Night at the Roxbury."  I won't ever see "Night at the Roxbury."  The two characters in this film, whose names I'd rather not know, are hilarious in the Saturday Night Live sketches that lended the movie its concept, characters, and principal actors.  The problem that I have with this particular film is that it betrays the very concept of the sketches.  The sketches were meant to convey the caricature of two assholes at a nightclub bopping way too hard, trying way too hard, and aspiring to womanize but failing at it miserably.  As soon as these characters break free of the caricature and begin speaking, as I'm sure they do in this movie, the appeal is lost to me, as is the funny.
During the most recent Super Bowl, a commercial came on tacitly parodying the sketches, and it was funny.  It was funny becuase there was no dialogue; 
it was a metajoke in the spirit of the original joke.  For this, I 
applaud the Pepsi Corporation's marketing people.