My take on it, from my SFF blog:
http://sciencefictionfantasy.blogspot.co.uk
Pacific Rim had received some negative comments so I watched this one with low expectations, but was pleasantly surprised. There is nothing original in the plot, concerning mankind's battle with huge monsters – Kaijus – emerging from a portal in the Pacific ocean floor which connects to another world. Conventional weaponry proving ineffective, Jaegers – enormous humanoid robots, controlled by a pair of pilots stationed in their heads – seem to be the answer, until the Kaijus evolve to become bigger and more powerful. The hero is pilot Raleigh Becket (Charlie Hunnam) who pairs up with Mako Mori (Rinko Kikuchi) in a final attempt to end the Kaiju menace. Idris Elba and Ron Perlman also feature.
While we may have seen this kind of thing many times before,
Pacific Rim (written and directed by Guillermo del Toro) is a particularly competent example. It doesn't march
Battle: Los Angeles for gritty realism, but is leagues ahead of the risible
Battleship (both reviewed on this blog). The script is well structured, providing a good blend of tension, action, humour and other emotions, the acting is fine, while the Kaijus and the Jaegers are impressive creations and their battles are spectacular.
It is of course necessary to work a little harder than usual to suspend disbelief, not because of the Kaijus (as SFF fans, we expect this sort of thing) but because of the Jaegers. Is the best way of dealing with enormous monsters really to beat them to death with giant fists or shove a huge sword through them? There are plenty of weapons in today's arsenals which would deal with them very easily. It was a bit silly seeing the latest jet fighters attacking with their little cannon, when they have laser-guided bombs and missiles which would handily convert the monsters into pet food from a safe distance. If that's not enough, then station a warship over the portal and revive the Cold War Subroc rockets, which carried a small nuclear depth charge to deal with Soviet missile subs. One of those fired at the portal whenever a Kaiju was detected coming through, and job done. It wouldn't be so much fun, though!