One of the guest reviewers at romance review site Dear Author specialises in reviewing manga. She covers several different genres, including the m/m ones, and writes good, detailed reviews. The manga category in the archives is here:

http://dearauthor.com/wordpress/category/manga/

and the archive of entries tagged "yaoi" is here:

http://dearauthor.com/wordpress/tag/yaoi/


They've also got m/m and f/f tags, which cover all genres of romance. Not much there yet, but for future reference:
http://dearauthor.com/wordpress/tag/mm/
http://dearauthor.com/wordpress/tag/ff/

DearAuthor is a good site anyway - one of the few review sites out there to be (sometimes ruthlessly!) honest about the books they review.

I think they must clear out their archives, though, or else not include archived material in the tagged categories, because I have (had?) a m/m novel reviewed by them earlier this year. (It, er *cough* got an A minus *cough*).

I think they just didn't start using the m/m and f/f tags until recently. Because I know they've covered more than those ones. Such as yours. :-)

I like the site because it gives in-depth, honest reviews that give me an idea of whether I'd actually want to read the book. Even though I'm published by a romance house, I'm more interested in cross-genre than pure romance -- but Dear Author is directly responsible for a number of additions to my Amazon wishlist.