"Hit movie?" Like heck it was a hit!
According to the Internet Movie Database, Mothman was a flop, opening in January 2002 (not 2001) with an $11 million weekend. That was only good enough for third behind pop star Mandy Moore's A Walk To Remember and a whiz-bang remake of The Count of Monte Cristo.
By the end of March 2002, word of mouth had killed Mothman, and it was yanked from US theaters after a paltry $49,000 weekend brought the gross to only $35 million domestically. The film's budget was $42 million.