It's a satire/send-up of Classic Drive-In fare!
I just saw this movie on TCM tonight and I read some reviews here after it ended and my opinion is it was intended as a satire/spoof of the Classic "Giant Creatures Gone Amok" movies of the 1950's! Definitely NOT meant to be taken seriously as many reviewers and discussions seem to think. The movie uses cliches, situations and character stereotypes from those movies, in fact it even makes a self-reference in the scene where the Sheriff goes to the Drive-In theatre (remember them?) and rallies the movie goers to fight the approaching horde of Monster rabbits! The Producer and Director however, failed to realize the opportunity to make this scene even MORE self-referential by showing one of the movies they were spoofing like "Them!", "The Amazing Colossal Man" or "The Blob" on the movie screen instead of the "Tom and Jerry" cartoon!
"...and your suffering will be legendary even in Hell!!"