You know, much of that is directed by the chain's perception that guests in North America only like neo-classical decor. There may be some truth in it, as is reflected in the style of furniture in furniture stores everywhere. In my last project I tried to used more modern approach with clean lines. The scheme got shot down in the first week.
Europeans are more in tune with modern design -- IKEA, Italian design etc. Another factor is that majority of hotels there are not chain-affiliated. Hence there is more design freedom.
The W caters to the high-end market segment that is fashion-conscious, who would appreciate high style of design. The W is hip and beautiful. I think they are still learning to find the right furnishings that would stand the wear and tear in a hotel environment. I don’t think the solid colour carpet works.