I happened to stumble upon this URL that does weekly updates and measurements on how each major travel websites (mostly hotels) perform and is split into two categories:
As of June 27, 2011, Marriott ranks second and first, respectfully. See URL at Lodgiing Index
These two attributes mean nothing to me. What does get my blood boiling, and I have written about it here several times, is the constant need to keep signing into the Marriott site once the previous session had timed out . I wrote to the webmaster about this years ago and it was never addresses.