On Demand movie highlights

Deep Impact ½

(Showtime on Comcast) Director Mimi Leder wanted the human element to count as much as the expensive thrills in this killer comet movie. But the thrills, including a tidal wave, are most of what’s fun to watch as a shallow script wastes Morgan Freeman, Tea Leoni, Vanessa Redgrave, Maximilian Schell, Elijah Wood, and Robert Duvall in an all too obviously calculated countdown drama. (PG-13; runs through Sept. 16)

Barbershop 2: Back in Business

(Showtime on Comcast) What’s best about this meandering, episodic 2004 sequel to the 2000 original is the social commentary. There’s a new one at least every 20 seconds, until, of course, there isn’t. The movie’s jokeless interludes stretch a crowd-pleasing comedy into sloppy and ponderous tedium. Queen Latifah joins a cast, led by Ice Cube, that’s still appealing, but the movie is too overstaffed to do anything creative. (PG-13; runs through Aug. 25)

Deep Rising½

(Showtime on Comcast) Dumb, noisy, violent actioner that is far more fun than it has any right to be. Treat Williams leads a ragtag group trapped on a sinking ocean liner with a really big, really nasty sea monster. You’ll enjoy the cheap thrills, even if you’ll hate yourself in the morning. (R; runs through Oct. 28)