This has been a quite entertaining movie. Not really a top notch movie, not really working as a comedy, but still pretty entertaining. It started out veeery slow and boooring - it took a little too long for it to evolve. But when it started to it got better and better. There's that very freaky story and a wrecked Bonham-Carter (she's good playin such characters ;-) adding most to this film. However the ending was a little too fantastic since it shouldn't be a problem for the forensics to ... no, I won't spoil hehe.
My favourite scene was Martin's call where he spoke to that guy who answered the phone with "barbie's bakery. it's mr. muffin man speakin." LOL
My overall rating is: 6.5/10 - if you're not sure what to watch, try this one. It works pretty well as entertainment.