OK so we're in magento 22.214.171.124 and for some reason the following logic returns false all the time
<?php if ($this->getAllowWriteReviewFlag()): ?>
Even if I log in, I have the option "System > Configuration > Catalog > Reviews > Allow guests to write reviews" set to true, so technially that function should return true. If I log in, I get the same thing.
Also, I have checked that Mage_Reviews is enabled in System > Config > Developer > advanced