I've been thinking over this issue for the past couple of days.
Let's say I have a product page. This product has 30 reviews. Only 10 reviews are shown on the product page. Additional reviews are paginated with 10 on example.com/product.aspx?review=2 and so on.
Is there any advantage to having that content indexed? I imagine it would be considered "thin content", since there would be multiple pages about product A, but with slightly different content.
Would it be better to canonical those paginated reviews pages to the main product page? Or would more traffic come to those pages, since there is additional unique content. FYI, the paginated reviews page include the same sales copy, so conversions should be relatively similar for those who land on the main product page vs the paginated reviews product page.