I think the thing is, many who watched the UK show found it original, done in an original way, etc. So, when you see it remade, no matter how well it is remade, it's hard to live up to the original.
The UK version is different from the US version, and it's hard for some to seperate them. The UK version is like that old blanket you've had since you were in college. You love it. You know everything about. So, when you buy a new one, even though it's the same comforter, same company.. you can nitpick it because of things that have changed.
Just the way it goes.
That said, I do find the UK version superior in almost every aspect. That is a problem because so far, the US version hasn't offered anything "new". For those who've seen both seasons of the UK version, these episodes are like watching repeats.