I think the movie was popular with kids, but not so great for adults. I looked it up on wikipedia and it cost 130 million to make, took apx $140 million in domestic USA sales, then sold apx $245 million of sales internationally. It made money and was a success in that department, but a giant Lizard running around New York and a remake of the 1954 original was always going to be a little bit of a stretch for adults.lol
The pinny stays faithful to the 1998 movie so in that department, Sega did a really great job. X-Files as u mention, is a great pinball machine. I will do a review of that one as well since I am very familiar with all Sega titles.
One thing I have found out, after going on a few Japaneese arcade sites, is that the GODZILLA Pinball Machine is extremely popular over in Japan and is a collectors item that no-one lets go from their collections apparerntly. You dont see them come up for sale much in the USA either, given only 500 were made.