If you like Motoni Modoru, you'll also like this series. If you don't, stay far away. There's plenty of over-the-top humor, some sexual violence, romantic relationships that are no where near cut-and-dried (your opinion of who Bluecat will end up--and there are a number of candidates--will change by the chapter), and lots of seemingly random plot developments.
That said, if you like that sort of stuff, you'll like it, but if you like an easier to follow, more developed story--and also dislike strange humor, you won't. Personally, I do like it--not all the time, mind you--but boy is this mangaka a unique read. There's no one else out there (who does yaoi) that's quite like this, so it makes for a unique, flying by the seat of your pants read, vs. the normal (and often dull) slice of life high school boys/buisness men in love storylines which seem to make up 90% of all yaoi. The world of Tantei Aoneko is its own crazy, unique place filled with crime, intrigue, and lust and the stories range from the absurd to the heartbreaking. As I said, it's not for every yaoi fan by a longshot, but many will quite like the uniqueness of Motoni Modoru's vision.
One final note, I don't like to pick on scanlation teams because they work hard and do it on a voluntary basis, but I must say, the translation for this isn't the best. Motoni Modoru really plays with language, so any translator trying to do one of her works really has a tough job, but the amount of engrish used in the scanlations really proves to be distracting at times. I think with a cleaner translation, I would've rated this series a bit higher.