Tobaccoreviews.com is a huge database of reviews of pipe tobaccos. I have not researched its extensitivity thoroughly, but at least it contains all Finnish and Swedish specialities I have searched, so I think we can safely conclude that it is quite extensive.
The site consists of reviews submitted by the users. The depth of some analyses of taste is astonishing. I think that is characteristic to all web sites centered around a hobby. There are always people that become very good in the hobby, whatever it is. My modest Cigarette of the day -reviews pale in comparison with the best reviews in the site, but of course, the quality of the reviews varies also there.
When deciding whether to try a certain tobacco, it is not a good idea to rely on the number of stars given in the site. Your taste may be different from the reviewers’. It is a better idea to read the free text in reviews to see what kinds of taste elements there is in the tobacco, and decide whether those elements are the ones you desire.
And of course, one must remember that those people smoke pipe, not pipe tobacco in cigarettes.