First of all, I've seen Freddy Got Fingered like 5 times, it's not all that hard to sit through. You're right though Hipmonlee, it's lazy low brow humor, it's not trying, the whole movie just doesn't give a fuck, you have to accept this before you watch it (or sometime within the first 5 minutes) if you want to have any hope of enjoying it.
Second, I don't think it's possible for movies that aren't comedy movies to actually be bad. Any action film or anything like that is just going to be met with laughs at how incredibly bad it is at being serious. Because there's nothing better than messing up a non-joke. On the other hand, a million trillion shitty jokes compacted into one and a half hours of plotless nonsense is god fucking awful. See the '____ movies' that Hipmonlee was referring to. (Miles worse than Freddy Got Fingered, really.) Meet the Spartans, Vampire movie, The 41 Year Old Virgin who Knocked up etc.
Fucking awful.