"I'm not sure you know how hard people work [on films]. I'm not sure you know how beloved the movie is around the world. Being hard [on a film] is really easy if you don't know the underbelly of what [went into it]. When you do know the forensics of a movie - the participation and decisions of others that one has to stand in front of - you can't help but see it differently," he said.
Costner, who also produced the movie, added that he does not consider it to be a "low point" in his four-decade long career.
"It could have had a better, more obvious outcome. The thing I know is that I never had to stand taller for a movie when most were going the other way. The movie with all its imperfections was a joy for me ... a joy to look back upon and to have participated in."
Bruce Feldman, who worked on the PR team for Universal when the movie came out, also defended Costner and the movie.
"Kevin was under a lot of pressure, and at the end of the day the film did quite well. Everything in Hollywood can't be perfect ... you can't be perfect ... some things work out brilliantly and some don't."
At the time of its release, the US$170 million budget made Waterworld the most expensive movie ever made. It came just four years after Costner won two Oscars for directing and producing Dances with Wolves.
- nzherald.co.nz