We were supposed to stay at the Sheraton this past weekend. There was some boat show going on, which made the hotel very busy (full) and we were not able to be upgraded. The room they goave us had an odd smell and the sheets did not look to have been changed (they probably were, but they looked wrinkled). We were not happy and the PLT concierge managed to get us into the Westin, which was much better, even though they only had double beds and no upgrades available (also full due to boat show). They did offer to move us for our second night, but we were fine where we were.
I generally do not care for Sheratons, especially U.S. Sheratons. I'm an Asia-Pacific guy and hold hotels to very high standards.