The current version is in my opinion a lot more dynamic, which on the other hand might be seen as clutter for some. Then again I believe everyone in the SFML Team 8and others) is slightly bias since
to the current layout and since we've seen it so often we're now also liking it more than other things.
I think the main problem is however that the huge book with it's contrast is so much attention grabbing. So when you first open the site all you see in the first few milliseconds is that book icon, then you might start reading what's at the top left and suddenly the brain makes connections where there aren't any.
I wonder if
this image (click to view) makes a difference for some. Made it brighter and smaller.
A solution (if one is needed), could be to simply add a slightler darker block background to the Wiki row.
This looks quite bad IMHO since it doesn't fit in at all.