Why do people say the pats are overrated?

i know that they fell short of completing the perfect season but to say that their overrated is part sore winner and stupidity!!! I know not everyone feels this way but ive been coming across some responses that puzzle me. the pats went 18-0 for god sake and the only team to have done that in the history of the nfl. sure they didnt win the superbowl but to go as far as saying their overrated is wrong! the only reason why this game was so hyped up was the fact that history was going to be made tonight cause of the pats undefeated streak!!!