Despite the fact that it is a low budget movie and that it is a sort-of remake of Invasion of the Bodysnatchers, The Invasion is a very good watch and well produced and acted by all those concerned. The plot itself is very interesting and done very well considering the scale and budget of the film and it certainly has a classic B-movie type feel to it. The script is well written (if elements are taken from Bodysnatchers) and despite a slowish start and a rather quick resolution the tension is ramped up brilliantly and at times will have you on the edge of your seat.
Nicole Kidman and Daniel Craig perform well as the main characters helping the film flow very well indeed while all of the extras are convincing as the possessed humans. At times the cinematography can also be quite impressive, especially during the chase sequences where there are some brilliant shots of hundreds of non-humans chasing whats left of human kind and scenes like the one where the car is surrounded are tense, shocking yet somewhat brilliant. As said though the film does take a little while to get going and the resolution is somewhat convenient but the message portrayed through this film is very thought provoking indeed.
On the whole The Invasion is not a big budget effects based sci-fi drama it relies more on its gripping, tense and thought provoking script and some decent acting by its entire cast and it does this very well. What budget the film has is used to great effect as are the lead actors while at times the film will have you on the edge of your seat. In all a very good film that builds the paranoia and the tension brilliantly but at the same time it delivers a decent message to its viewers via an invasion that is actually a non-invasion. Cant we humans just all get along?