I have seen plenty of alien/monster horror movies and some have been good and others remarkably bad.
The movie starts of well with good effects but the overall story and poor casting of talentless characters let this film down.
The film is about a girl who buys a stuffed teddy bear not knowing a horrifying creature(or insect) has made a home inside it. As you've guessed it, the girl brings the teddy bear to her home and all hell ensues.
The title of the movie "The Nest" is apt, it shows that instinct of the creature it portrays. Blue Monkey
(1987), Slugs(1988), The Nest(1988), Ticks(1993), They Nest(2000) are similar movies.