Both of those sites both have many problems, though the U.K. site is definitely the lesser of the two evils.
From a visual design standpoint, the U.S. site is simply awful. The 3-column design sucks, the whole "cutout" scheme is stupid and confusing, and there are way too many unnecessary elements (especially those purple bars). At the top, they establish yellow/red as the "link" colors and purple as unclickable, but then farther down the page, purple/red are the link colors, and yellow is unclickable.
The blue dotted bars are there for no reason – In particular, look at the one underneath "Featured Cool Move" – It isn't separating the picture from anything at all.
Also, there are two main navigation bars, and several minor navigation bars. From a UI design standpoint, that's a huge no no.
Though the U.K. website is a lesser offender (the navigation bar is very good, and their three-column design works wonderfully), it still has a number of issues. The brown navigation bar at the top, in particular the drop-down menu, have seemingly unrelated things (not to mention not conforming to the rest of the site's design).
There isn't an obvious link color – You've got some white links, some black links, and some image links. There needs to be a dominating color. Also, the Register and Login links use a modified guillemet (also known as double quotation marks, normally used in French), and are white, yet are unclickable. Yet, the search box uses the guillemets as the only way to click. Inconsistent.
From a coding perspective, both sites are downright awful, though in this case the U.K. site is actually worse, since it has a million of scripts imbedded in totally random parts of the code. I won't bore you already bored folk with a deeper analysis of the source code or the total lack of semantics.
