I personally thought there would be more story to it.
For example, when he captured the female monster and the male monster briefly tries to rescue it before getting burnt by the sunlight this was the first time you are introduced to the main male monster character who is head of the pack (iirc). The next scene was when Robert Neville documents that they now show no human instinct, I thought the story would go on to disprove his theory considering the previous rescue attempt.
With the movie focussing on this monster character I thought the monsters were working on a plan to rescue the female - especially when they showed the initiative to setup an identical trap to Robert Neville.
This continued all the way up to them storming the house and trying to get into the lab, but as you can imagine the ending was a little different to what I was expecting haha.
In that case there wasn't really any point at all in having the main monster character, the story would have been exactly the same without him.
I was probably just reading into it a little too much, all in all it was Ok, I wouldn't go and see it again thought.
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