The code at the top of the page:
//title
Html.AddTitleParts(T("PageTitle.CustomerProductReviews").Text);
//page class
Html.AppendPageCssClassParts("html-my-product-reviews-list-page");
Should be:
//title
Html.AddTitleParts(T("PageTitle.CustomerProductReviews").Text);
//page class
Html.AppendPageCssClassParts("html-account-page");
Html.AppendPageCssClassParts("html-my-product-reviews-list-page");
Also, since this is a Customer Account page, it may make more sense if it were located in the \Customer folder instead of the \Product folder (but this may be a matter of opinion since it is the Customer Product Reviews page).