Magento 2 Product Page – How to Show Review Without Rating

You need to loop through all the voting options and create a rating for each option selected and like it back to your review.

foreach ($rating as $ratingId => $optionId) {
     Mage::getModel('rating/rating')
          ->setRatingId($ratingId)
          ->setReviewId($review->getId())
          ->setCustomerId(Mage::getSingleton('customer/session')->getCustomerId())
          ->addOptionVote($optionId, $product->getId());
}

To get all the ratings you can use the rating's resource collection:

    $ratingCollection = Mage::getModel('rating/rating')
        ->getResourceCollection()
        ->addEntityFilter('product')
        ->setPositionOrder()
        ->addRatingPerStoreName(Mage::app()->getStore()->getId())
        ->setStoreFilter(Mage::app()->getStore()->getId())
        ->load()
        ->addOptionToItems();

Then for each rating object you can call getOptions() to get each possible option for each rating.

You can get rating summary of product by below code:

    <?php echo $RatingOb=Mage::getModel('rating/rating')->getEntitySummary($_product->getId());
     $ratings=$RatingOb->getSum()/$RatingOb->getCount();
    ?>
    <?php if($ratings): ?>
    <div class="ratings">
        <div class="rating-box">
            <div class="rating" style="width:<?php echo $ratings; ?>%"></div>
        </div>
    </div>
<?php endif; ?>

and need to css and image in css file / images file at Skin folder:

/* rating star */
.ratings { font-size:11px; line-height:1.25; margin:7px 0; }
.ratings strong { float:left; margin:1px 3px 0 0; }
.rating-box { width:69px; height:13px; font-size:0; line-height:0; background:url(../images/bkg_rating.gif) 0 0 repeat-x; text-indent:-999em; overflow:hidden; }
.rating-box .rating { float:left; height:13px; background:url(../images/bkg_rating.gif) 0 100% repeat-x; }
.ratings .rating-box { float:left; margin-right:3px; }

Using Block call

<?php if($_product->getRatingSummary()): ?>
<?php echo $this->getLayout()->createBlock('review/helper')->getSummaryHtml($_product, 'short'); ?>
<?php endif; ?>

Also check review/helper/summary_short.phtml is default or change

Also you can product rating by

$_product->getRatingSummary()->getRatingSummary()