It is a good alternative, if you do not expect too much. Those Hyatt branded hotels were supposed to be a notch below the Hyatt Regency's; no lounge, smaller public spaces, less amenities, but still the Hyatt name and an all mini suite set-up, which the living area divided by a TV.

The Panorama Suites, also available at the Hyatt Fair Lakes, a couple of stone throws away from Dulles are actually really nice with floor to ceiling windows and great views.