Before I launch into a speel on it, let me make sure everyone reads these words: GIGLI IS THE WORST MOVIE EVER.
Now that that's over...
Firstly, before anyone goes out to see this movie on the basis of learning yet more about the vaunted "Bennifer" love affair, don't bother. These two have about as much chemistry as a baby kitten and a rottweiler, and approximately the same capacity for acting. Bearing in mind that this movie is what spawned that ultra-expensive relationship, I would hope that Ben Affleck and Jennifer Lopez have a damn good prenuptual agreement.
I would equate the experience of viewing Gigli with being shot in the face -- except that I would imagine that the suffering inflicted by being shot in the face ends rather abruptly by the merciful release of death. There is no merciful release here, but don't think you won't be praying for death. There is absolutely no reason to see this movie. The plot is wafer-thin and roughly as dry, the dialogue is cheesy and moronic, and the acting is trash (as you might expect).
Now, it's not just that the movie is badly directed or ruined by the "acting" of Ben & Jen. The script itself is so utterly and completely awful that it's difficult to imagine anyone reading it and not throwing up all over themselves. But our two lovebirds wiped the vomit off and dove in headlong.
The presence of Oscar winners Al Pacino and Christopher Walkin is even more inexplicable. Were they forced at gunpoint to be in this movie? Drugged? I don't know, but I suspect foul play.
Raunchy conversations and love scene so stupid that it is physically painful round out a thoroughly dreadful movie-going experience. Gigli is proof that there is no god: if there were, it simply would not be allowed to exist.
Avoid.