Why the terrible score? False votes?

The score is because it is just not very good. It is trying to be high farce, but even though the characterisations are entirely over the top - the too English Englishman, the too Texan Texan, the over-the-top Japanese, the snooty staff at the Savoy - they are just cardboard cut-out characterisations and at best are slightly embarrassing.

Talking of slight, the plot is obvious and stereotypical. Seeing the Coen name, you'd expect it to not pull its punches, but the director seemed to want to make it a Farrelly Brothers film without the all out grossness (perhaps he got the brothers mixed up?) - compare the landlady in Kingpin with the mother spitting tobacco juice - a scene in the trailer for the film (as opposed to a scene in the trailer, which it was!).

I guess the other part that irritated me is that it is made clear from the outset that our hero is not competent and he is belittled at various points, but the trouble is that you feel he deserves it, (they forget to get the character to do anything that shows he is nice underneath it all), and you don't see what he has done to earn any sympathy from the other characters or the audience. In the end, you don't care whether he wins or loses, which seems a critical failing in a scam plot.

Because it's one of the worst movies of the year (according to Mark Kermode).

https://www.youtube.com/watch?v=xtOYDLzxydE

You expect quality from such credits like Colin Firth, Alan Rickman, and the Coen brothers. Not this huge disappointment.

Speaking of score, where is Carter Burwell who always composes the Coen Bros. music? Have they had a falling out? I hope not!