No, you haven't made a poor choice AT ALL! Think of it this way... when you stay there, the rooms have all been refurbished within the past 2 years, the main pool has been refurbished, Old Port Royale will be refurbished with a brand new sitdown restaurant. In essence, it will be the "newest" moderate on property due to all of the work they are doing on it now!
Relax, and have a great time!