Under the category of useless, disposable junk you'll find Obsessed featured, front and center. In fact, I'll put ten times as much effort and energy into writing this review than screenwriter David Loughery, director Steve Shill, and stars Idris Elba, Beyonce Knowles and Ali Larter all added together, put into making this movie.
Essentially, Obsessed is just a very warmed over rip-off of all those thrillers from the 80s and 90s, where a seemingly normal individual becomes psychotically and violently infatuated with someone else. Fatal Attraction started the fad and it finally devolved to films like The Temp and The Crush. Obsessed is like Fatal Attraction crossed with The Temp only with all of the thrills, originality, good acting, and, well, any other positive quality you can come up with, sucked out. It's just a husk of a Lifetime movie masquerading as something more.
The plot is exactly as you could predict without having to see frame one. Elba and Knowles are an impossibly happy couple who've just become parents. Elba gets a promotion at his business and one of the perks is his own secretary. Larter is the temp who fills in and flips out over Elba's sexual charisma, or something. Yeah, I don't get it. Elba hardly displays a personality, let alone one that is the impossibly hot chick magnet he is potrayed as here. Anyway, Larter propositions Elba, Elba spurns Larter, and then Larter systematically tries to ruin Elba's career and marriage. She's obsessed, see. Knowles is on hand just to act shocked and throw out some "oh no, she d'int" attitude.
Obsessed just goes through the very predictable motions to the very predictable battle to the death conclusion without a single original moment during its entire running time. It's thrill-by-numbers. For those who find Obsessed to be anything more than just a complete waste of time and space hasn't seen very many movies...or hasn't seen any movies.