Give the hotel a call a few days before you go down to make sure everything is secure with your reservation and the room you reserved. Those are really the only issues that people have been having.
I never take reviews on trip advisor seriously. There are lots of uninformed at simply untrue statements on there. One of the people said that all the rides stop if it rains. That is simply untrue. Others said how bad the restaurants were. There are three excellent restaurants with menus to satisfy anyone. Someone else said it was like a Motel 6. I'd love to see the Motel 6's that they are staying at! Someone else said the pool was just ok. The pool is huge and excellent!
I have stayed at some great hotels that trip advisor patrons have trashed. I would pay more attention to the reports on this board.
Go and have a ball. The rooms are average sized, the hotel ambiance is incredible, you can walk to everything, the food is great and you get unlimited express passes. How bad can that be?
Look at the pictures here:
http://www.wdwinfo.com/universal/photos/Royal-Pacific/index.htm and here:
http://www.uomeetingsandevents.com/Hotels/Royal_Pacific/Gallery/Gallery.asp
This is exactly what you get.