Patrick
The thing to consider is in all probability human nature dictates that where people have had a good experience they go home and tell their friends and family about it but dont necessarily comment either to the hotel, message boards etc but you can guarantee if they have had a bad experience then they will be quick to make sure as many people as possible know about it.

At the end of the day it's booked , presumably paid for so if you can't change it, don't beat yourself up about it too much but go along with an open mind and judge for yourself. If you have your brochure details with you to compare and when you arrive it is lacking (or usually the most important dirty etc) then make sure you ask the hotel and if necessary put in writing your concerns whilst you are there and ask to be reaccommodated if necessary.

I'm sure it will be just fine, the Sheratons worldwide that we have seen have been of a reasonable standard.

Have a great trip and dont forget to tell us all about it when you get back (or sooner if you can)