it looks likes a homepage of a product of years of advanced research, and a homepage which was made years ago.
trendy and pretty matter a lot for first impressions, and making a first impression is very important.
The current Haskell website, while it may have a lot of nice and useful information for informed and commmitted haskellers, does not do a good job of making the language look approachable, easy to learn, and interesting.
Sidenote: having a Programming Language website that requires javascript shouldn't be a problem nowadays, when most consumer websites require javascript.