I am a Marriott Platinium so it took quite a bit to get me to switch to the Grand Hyatt in Shanghai but it was worth it. It is simply one of the most spectacular hotels I have ever stayed in. The rooms start way up on the 53rd floor and go up to the 87th floor. The bathrooms are jaw-dropping. Where else can you soak in a tub 80 floors over China ? The new subway to the 'old' Shanghai is just a short walk. Forgo the Marriott just this once and try the Hyatt. You'll love it.
Paul