Just stayed here for an emergency overnight due to weather cancellation of our original flight. It was three overnights actually but the first two we used up some IHG points (our secondary program after Hyatt) for a pleasant stay at the Williamsburg Indigo.
Overall, we weren't expecting much given the reviews but were quite satisfied. It's a Hyatt Regency, and honestly I don't have high expectations of domestic US lounges - so many Regencies have permanently closed their lounges and/or still haven't reopened theirs and/or have subpar lounges. This one is at least open, it's quiet and relaxing, and there's some free stuff there. Orange juice. Hot water. Bananas. Not asking for a lot.
We arrived at 11am expecting to just drop off our bags but they were able to check us in early which was very nice. Given the reports of the noise issues in the executive suites we are sort of glad we didn't get that. It was a spacious king room at the far end of a higher floor and thus very quiet indeed, far from most other people at the hotel.
We arrived by car which I returned early to save money and I came back via train - there is a free shuttle that runs 8am-2am and is waiting there for you at the subway exit (of the Aqueduct station not the Aqueduct Racetrack station, but confusingly the Aqueduct Racetrack EXIT of the Aqueduct station).
The driver insisted he was going to "only the casino and not the Hyatt" but it's the same thing.
Overall pleased with the hotel for an overnight provided you aren't expecting much food wise. We ate in the city, actually, and slept in the hotel because our rescheduled flight was for the next early morning.