One thing about the online rating system, it is a bit counterintuitive.
If you REVIEW a store, your 5 star rating is not part of the calculation for the 5 stars listed on the main page next to the name.
For that reason, I recommend entering a review (if you choose to post your comments), and then rerate the store using only the RATE button on the right hand side.
The RATE button is what actually adjusts the star output on the main page.