Hi,
If you go on the search page, do not fill make or model, click on "Search", you get the list of all vehicles of the site.
The like on all movie/vehicles pages, from the lists at the top right corner you can change the sorting, to get the cars sorted by rating:
http://www.imcdb.org/vehicles.php?resultsStyle=asImages&sortBy=4&make=&model=
Note that some of the cars listed as 5-star do not deserve it, maybe some should be modified to 4 stars.