We implemented hReview-agregate on our review site more than a month ago but Google still doesn't display the little stars in SERPs. Our site ranks very well, individual pages are in top positions in 99% for all relevant searches above our competition who do have the review summary displayed with their listings.
Here is the syntax:
<h1 class="fn">BUSINESS NAME</h1>
<span class="rating"> Rating:
<span class="average">1.5</span> out of
<span class="votes">23</span> ratings. This page contains
<span class="count">19</span> user reviews of BUSINESS NAME
Users can review or just rate businesses within our niche.
Are we doing something wrong or are we just too impatient? Thanks.