'Man on a Ledge' ridiculous but engaging

In the cinematic desert that is the January-February movie-release schedule, one gains a greater appreciation for mere competence.That's precisely what you'll get with 'Man on a Ledge', a mid-budget thriller with modest aspirations and genuine popcorn appeal.Sam Worthington ('Avatar', 'Clash of the Titans') stars as Nick Cassidy, a former New York City cop wrongly convicted for the theft of a prized diamond.After exhausting all judicial avenues for exoneration, he takes the unusual and seemingly desperate next step of planting himself on a ledge outside the penthouse of midtown's Roosevelt Hotel and threatening to jump.An NYPD psychologist (Elizabeth Banks) is summoned to talk him down, unaware that Nick harbors an ulterior motive.From his perch above midtown, he is secretly orchestrating a scheme to take revenge against the corrupt corporate chieftain (Ed Harris), who engineered his demise, and prove his innocence once and for all.