Being not either British or American (I'm Australian) I guess I have the advantage of being unbias towards both.
Although the pilot episode for the US version is almost exactly the same as far as plot and characters go, it lacks the magic that the UK version a brilliant and memorable show.
I was hoping that the American version would go in with its own style and make its own distinct mark - like the remake of Battlestar Galactica - but the show seems desperate to keep to the original as much as possible. So why remake it at all? You may aswell as watch the original British version, because Jason O'Mara and Harvey Keitel are simply no match for John Simm and Philip Glenister.
I still hold out some hope for the show, and hopefully it can come up with its own original storylines. However, this seems doubtful with the 'red dress' flash seen in this episode.