We stayed in the North Garden Wing last year and it did seem to be pretty run down. Thankfully, there were no cleanliness issues, it was just a lot of wear and tear and I was surprised that Disney would let it get to that point. If you think that will affect your vacation, then yes, I would recommend you contact CRO right away to try to change your resort.
The disrepair at the North Garden Wing was not enough to ruin our trip, but then again we had a great overflow rate from Shades of Green and I think I would have been very disappointed if I had paid full rack rate. I don't think it would hurt to check around at other hotels if you are concerned.
Good luck!