Answer: the Internet (Score 1)

One of the (many) reasons it tanked so early out of the gate is due to the internet. When Star Trek V was out in theaters, people still went to see it before they knew just how dumb it would be. Now, with the wonders of the internet - everyone can check reviews, see Joe Commoner's opinion, read tons of rants, etc.

The word of mouth on this movie was so bad, I'm sure it kept many people at home.