Turn your brain off, because there's no art here, precious little story, some really bad effects (and some really good ones, which make the bad ones even worse), so-so acting. That sounds exactly like a review of Starship Troopers doesn't it. I loved starship Troopers. And I loved Mega Shark vs Giant Octopus too. In amongst all the cinematic gourmet meals on my DVD shelves, this is a gigantic burger with loads of gherkins, and both ketchup and mustard. And I don't care that it's bad for me.
Update: 2 Sep 2009: it has been brought to my attention that I may have to add a disclaimer that my review of this film was influenced by drugs. Namely two bottles of wine.