The flim starts off OK, with some retcon happening to the original flims where the events of 28 weeks later are ignored.
The movie gets messy about half way through, and starts to work away from the survival horror aspect that worked so well with the original.
The last few minutes then proceed to take a big shit on the tone of the survival horror aspects of the flim and turn it into a comedy which left everyone in the screening saying how dissapointed they were when exiting the cinema.