1) Forces a particular size/resolution, locking out zoom capabilities
2) Has a floating header with a constant size relative to your device screen, blotting out the same real estate no matter how much you zoom. And, of course, using the same header pixel height for portrait vs landscape, making the latter practically unusable.
Yes, this site is better than 99% of mobile sites out there.
Edit: Some further comments: It's generally better to have a site that obeys the standards and thus plays nice with any client, than one that locks you into the hip designer's meth-addled decision. This site in particular works well with my extensions like VimFX for clicking links from the keyboard.