I’ve created a custom product template to act as an iframed add-to-cart on a secondary website. All the product information is pulled dynamically, and one of the things I really wanted to include was the product reviews summary. No matter which reviews code I used, the reviews summary didn’t show.
Apparently, instead of using the catalog/product block type:
{{block type="catalog/product" product_id="498" template="catalog/product/wocc-product.phtml"}}
I had to use catalog/product-list:
{{block type="catalog/product-list" product_id="498" template="catalog/product/wocc-product.phtml"}}
Then the reviews showed up!
For more about customizing the Magento Reviews Summary, this tells you how to make your own templates.