The repetitiveness of the cursing was the problem not the presence of it. Sure I expected it in the game especially given the plot and characters, but I didn't expect to hear it constantly out of almost every character's mouth. It ruined the credibility of the dialog by making it seem contrived, and it got old as the game wore on.
Sorry, but if I kept seeing a scary dude eating people's faces, an army of well-armed soldiers gunning for me, and a creepy little girl in a red dress, the first - and probably the most PROMINENT - thing out of *my* mouth would probably be "The F-Word".
I enjoyed the swearing. It made me feel like I was playing an ADULT game, rather than some sugar-coated piece of shit mainstream turd title. If a game makes me say these words out loud in shock and surprise (even on the second and third playthrough), I want to hear the other characters in the game saying them too.