This is a film made for the cable television channel SyFy which is probably as much information as you need to judge how good this film is.
Synopsis: A group of people are gathered in an underground laboratory in a Federal building, including scientists, military and politicians to see a presentation of an experiment into viewing other dimensions. There is an accident and instead of just viewing another dimension the whole lab is ripped out of our dimension and dumped into a parallel dimension populated only by plants and giant carnivorous CGI monsters. The survivors must find a way to repair the machine that brought them here and escape the ferocious creatures.
As always seems to be the case with SyFy channel films, the problem lies in the writing. An accident in experiment is one of the laziest and most ham-fisted plot devices in cheap science fiction.The CGI monsters are good enough for the price but there's no attempt to set them in a believable ecosystem. What do the creatures eat when there are no humans? The writer uses idiocy as a plot device in different ways to kill off characters either through arrogance, fear or greed.
Overall this was a mediocre and lazy film. I can't fault any of the actors too much since they were competent enough with what they had to work with. Joe Flanigan plays his standard wise-cracking soldier hero part. John Rhys-Davies is the cynical arrogant Senator. Dagmar Döring plays the scientist in charge of the project.