After spending only 7 hours at the hotel, it seems a bit presumptuous to write a review about the Hyatt Regency Crystal City at Reagan International (technically in Virginia). However I think I slept a total of 2 hours, giving me 5 hours to experience the hotel. I think that qualifies me as an expert.
I booked the spectacular mistake fare to Beijing but needed to position myself at DCA to begin the run. As my flight out of DCA was at 7:15am, and I was coming from Seattle, I knew I would need to spend the night in DC. My flight arrived at 10:00pm and they Hyatt Regency Crystal City was a good option as it had a free shuttle every 20 minutes to/from the airport. Apart from the driver leaving the airport with the shuttle door still open, it was a painless experience to get to the hotel.