The effects weren't that amazing. This wasn't really meant to be an action flick. The effects were never meant to draw in the audience. If you were looking for a movie with good effects, go watch a no-brainer like Transformers or GI Joe. This movie was about the story, not the pretty pictures on the screen.
Actually, if you understood CGI, they were extremely amazing, almost revolutionary. Only one other movie has used such a standard, Cloverfield. Just because there isn't a ton of fancy stuff, doesn't make it less amazing. Watch the camera jitter, the CGI moves with it almost perfectly, that's the amazing effect.