Originally Posted by Sly

No. Loudly commenting on the movie is incredibly rude and there's nothing right about it. People pay to enjoy a movie on the big screen with good sound, not to hear some dude 10 rows up giggle and yell at the screen.

Quiet comments to your friends is fine, just don't disturb others. Its no different than somebody leaving their cell phone on. Annoying, rude, and inconsiderate.