Yes, this document is FUD. Frankly, I'm surprised they released this... The tone is: desperation.
That said, the NOSQL movement is so full of hype... It really annoys me that whenever anything new comes around, a large amount of people want to use it for EVERYTHING! NoSQL is inconvenient for a lot of what it is getting used for today... In 5 years, we'll be past that and we'll see it used more appropriately.