Overpriced, value not quite there
First off, I've stayed in several comparable hotels throughout downtown Seattle so I have a good standard of measurement. My wife wanted to stay in a place with a pool and friends were staying in a neighbouring hotel so we decided to try the Hyatt at Olive 8. I called for reservations, and they said their system was down, and she didn't think they had any rooms left, but she would call me back in an hour. No call back, ever, so I booked on Hotels.com without issue. 
Check in was fine. We asked about babysitting and they gave me 2 phone numbers, I asked if they made arrangements with a service for us, and/or billed through the hotel and they said that they could not "legally". I mentioned that the Fairmont offers this service and the response was "well they are a higher class of Hotel". I responded "with my corporate rate they are actually $10 cheaper then you and closer to the stadium" as I thought to myself, if they are higher class what am I doing here? 
The room was fine, modern, comfy bed, decent linens. I get the whole environmental thing but going with scratchy toilet toilet paper is not something I would sacrifice. Coffee in the room, but no sugar. view was nice, but no balcony etc either. 
Parking, as it is in almost ANY Seattle hotel, is very expensive, and even though I called 40 minutes ahead to have the valet get my car ready, when I went down there 5 minutes later than I told them, they hadn't even thought about going to get my car, but they did get another guys car who just walked up and asked faster than mine, so our guests were left waiting with us.
The pool was quite nice. $5/bottle of water is crazy, especially when neighbouring hotels offer it free. All in all the hotel was nice, but unimpressive. I won't be returning, I find better value elsewhere.