Are there any good websites that catalog professional reviews of literary works? The best/only one I know of is the Complete Review (www.complete-review.com/maindex/maindex.html), but while their selection of fiction is very good if incomprehensive, their poetry section is lacking horribly (http://www.complete-review.com/maindex/poetry.htm). Are there any other options? Not interested in sites that focus on pop/genre lit, ofc.
I don't think that literary reviewing has the same critical mass or general public interest that movie reviewing does (there's no real history of it on TV for example). And of course much of the reviewing that does exist is of pop lit. The only review aggregator I can think of is the one you mention.
It's kind of pointless for literature.
If it's hundreds of years old and still being publishing then it's influential enough, or good enough to be read.
If not, then you probably can't read it anyway.
Why would you need a critical score of Homer for example? What would be the point?
the thing is that "rotten tomatoes" and "metacritic" are good for things that are easily consumed and where consensus is more important than detailed examination.
With poetry (which you seem to want something like this for) there is no point in such a system. Most "expert reviewers" would hate any sort of number system forced on the system. It turns literature into a status symbol -- "which poems did you rate five stars? whoa, a Shelley poem? plebbbb" -- when in reality, reading, especially reading poetry, is a solitary event and many great poems can only be quantified by the reader. Nobody who actually reads poetry would want to put a star rating on their favorite (or least favorite) collections. Let alone favorite poems.
So really, what you're asking for is a mass-consumption oriented rating system tailor-made for a non-mass-consumption endeavor.