I loaded a PDF at random. Table of Contents works fine. Landscape mode works fine (but I'm pretty sure it did on my Kindle 3/keyboard also). There is no way to apply a crop throughout, but you can pinch to zoom. I don't see a reflow.
(I'm not sure calling it 'crippled' is really necessary either way--PDFs are traditionally the enemy of standalone e-readers. PDF is typically used for complicated documents with lots of elements/tables/images, etc. e-readers are better for mostly-text books. If you need to view complicated PDF documents regularly, you're better off with a tablet (in my opinion). I suspect this is due to hardware limitations of a device that is expected to also work in sunlight and have a battery life of months, not a corporate plot.)