No, it's not legal. But only non-MPAA-affiliated films are the subject of torrent lawsuits. The MPAA gave up that tactic a while ago. Movies like The Expendables and The Hurt Locker aren't MPAA-affiliated. Those lawsuits are being pushed by independent lawyers trying to get rich quick through mass settlements. Of course, that doesn't prevent them from suing in the future.

Also, legislation differs depending on the country you live.

Get informed!